diff --git a/humanize-duration.js b/humanize-duration.js
index 4646f4e..f326a9a 100644
--- a/humanize-duration.js
+++ b/humanize-duration.js
@@ -13,6 +13,17 @@
       ms: function (c) { return c === 1 ? 'جزء من الثانية' : 'أجزاء من الثانية' },
       decimal: ','
     },
+    de: {
+      y: function (c) { return 'Jahr' + (c === 1 ? '' : 'e') },
+      mo: function (c) { return 'Monat' + (c === 1 ? '' : 'e') },
+      w: function (c) { return 'Woche' + (c === 1 ? '' : 'n') },
+      d: function (c) { return 'Tag' + (c === 1 ? '' : 'e') },
+      h: function (c) { return 'Stunde' + (c === 1 ? '' : 'n') },
+      m: function (c) { return 'Minute' + (c === 1 ? '' : 'n') },
+      s: function (c) { return 'Sekunde' + (c === 1 ? '' : 'n') },
+      ms: function (c) { return 'Millisekunde' + (c === 1 ? '' : 'n') },
+      decimal: ','
+    },
     en: {
       y: function (c) { return 'year' + (c === 1 ? '' : 's') },
       mo: function (c) { return 'month' + (c === 1 ? '' : 's') },
@@ -24,6 +35,50 @@
       ms: function (c) { return 'millisecond' + (c === 1 ? '' : 's') },
       decimal: '.'
     },
+    es: {
+      y: function (c) { return 'año' + (c === 1 ? '' : 's') },
+      mo: function (c) { return 'mes' + (c === 1 ? '' : 'es') },
+      w: function (c) { return 'semana' + (c === 1 ? '' : 's') },
+      d: function (c) { return 'día' + (c === 1 ? '' : 's') },
+      h: function (c) { return 'hora' + (c === 1 ? '' : 's') },
+      m: function (c) { return 'minuto' + (c === 1 ? '' : 's') },
+      s: function (c) { return 'segundo' + (c === 1 ? '' : 's') },
+      ms: function (c) { return 'milisegundo' + (c === 1 ? '' : 's') },
+      decimal: ','
+    },
+    fr: {
+      y: function (c) { return 'an' + (c >= 2 ? 's' : '') },
+      mo: 'mois',
+      w: function (c) { return 'semaine' + (c >= 2 ? 's' : '') },
+      d: function (c) { return 'jour' + (c >= 2 ? 's' : '') },
+      h: function (c) { return 'heure' + (c >= 2 ? 's' : '') },
+      m: function (c) { return 'minute' + (c >= 2 ? 's' : '') },
+      s: function (c) { return 'seconde' + (c >= 2 ? 's' : '') },
+      ms: function (c) { return 'milliseconde' + (c >= 2 ? 's' : '') },
+      decimal: ','
+    },
+    it: {
+      y: function (c) { return c === 1 ? 'anno' : 'anni' },
+      mo: function (c) { return c === 1 ? 'mese' : 'mesi' },
+      w: function (c) { return c === 1 ? 'settimana' : 'settimane' },
+      d: function (c) { return c === 1 ? 'giorno' : 'giorni' },
+      h: function (c) { return c === 1 ? 'ora' : 'ore' },
+      m: function (c) { return c === 1 ? 'minuto' : 'minuti' },
+      s: function (c) { return c === 1 ? 'secondo' : 'secondi' },
+      ms: function (c) { return c === 1 ? 'millisecondo' : 'millisecondi' },
+      decimal: ','
+    },
+    nl: {
+      y: 'jaar',
+      mo: function (c) { return c === 1 ? 'maand' : 'maanden' },
+      w: function (c) { return c === 1 ? 'week' : 'weken' },
+      d: function (c) { return c === 1 ? 'dag' : 'dagen' },
+      h: 'uur',
+      m: function (c) { return c === 1 ? 'minuut' : 'minuten' },
+      s: function (c) { return c === 1 ? 'seconde' : 'seconden' },
+      ms: function (c) { return c === 1 ? 'milliseconde' : 'milliseconden' },
+      decimal: ','
+    },
     ru: {
       y: function (c) { return ['лет', 'год', 'года'][getSlavicForm(c)] },
       mo: function (c) { return ['месяцев', 'месяц', 'месяца'][getSlavicForm(c)] },
diff --git a/test/definitions/de.csv b/test/definitions/de.csv
new file mode 100644
index 0000000..650b6e2
--- /dev/null
+++ b/test/definitions/de.csv
@@ -0,0 +1,72 @@
+0$0 Millisekunden
+1$1 Millisekunde
+2$2 Millisekunden
+5$5 Millisekunden
+12$12 Millisekunden
+420$420 Millisekunden
+500$500 Millisekunden
+1000$1 Sekunde
+1500$1 Sekunde+500 Millisekunden
+2000$2 Sekunden
+2500$2 Sekunden+500 Millisekunden
+3000$3 Sekunden
+1001$1 Sekunde+1 Millisekunde
+1002$1 Sekunde+2 Millisekunden
+2001$2 Sekunden+1 Millisekunde
+2003$2 Sekunden+3 Millisekunden
+1200$1 Sekunde+200 Millisekunden
+6900$6 Sekunden+900 Millisekunden
+30000$30 Sekunden
+60000$1 Minute
+90000$1 Minute+30 Sekunden
+120000$2 Minuten
+150000$2 Minuten+30 Sekunden
+180000$3 Minuten
+61000$1 Minute+1 Sekunde
+78000$1 Minute+18 Sekunden
+61001$1 Minute+1 Sekunde+1 Millisekunde
+61005$1 Minute+1 Sekunde+5 Millisekunden
+62001$1 Minute+2 Sekunden+1 Millisekunde
+62005$1 Minute+2 Sekunden+5 Millisekunden
+121001$2 Minuten+1 Sekunde+1 Millisekunde
+121007$2 Minuten+1 Sekunde+7 Millisekunden
+138001$2 Minuten+18 Sekunden+1 Millisekunde
+138006$2 Minuten+18 Sekunden+6 Millisekunden
+1800000$30 Minuten
+3600000$1 Stunde
+5400000$1 Stunde+30 Minuten
+7200000$2 Stunden
+9000000$2 Stunden+30 Minuten
+10800000$3 Stunden
+3660000$1 Stunde+1 Minute
+3720000$1 Stunde+2 Minuten
+10860000$3 Stunden+1 Minute
+11040000$3 Stunden+4 Minuten
+43200000$12 Stunden
+86400000$1 Tag
+129600000$1 Tag+12 Stunden
+172800000$2 Tage
+216000000$2 Tage+12 Stunden
+259200000$3 Tage
+302400000$3 Tage+12 Stunden
+604800000$1 Woche
+907200000$1 Woche+3 Tage+12 Stunden
+1209600000$2 Wochen
+1512000000$2 Wochen+3 Tage+12 Stunden
+1814400000$3 Wochen
+1314900000$2 Wochen+1 Tag+5 Stunden+15 Minuten
+2629800000$1 Monat
+3944700000$1 Monat+2 Wochen+1 Tag+5 Stunden+15 Minuten
+5259600000$2 Monate
+6574500000$2 Monate+2 Wochen+1 Tag+5 Stunden+15 Minuten
+7889400000$3 Monate
+15778800000$6 Monate
+31557600000$1 Jahr
+47336400000$1 Jahr+6 Monate
+63115200000$2 Jahre
+78894000000$2 Jahre+6 Monate
+94672800000$3 Jahre
+-420$420 Millisekunden
+0.12$0,12 Millisekunden
+1.5$1,5 Millisekunden
+420.69$420,69 Millisekunden
diff --git a/test/definitions/es.csv b/test/definitions/es.csv
new file mode 100644
index 0000000..47e99c5
--- /dev/null
+++ b/test/definitions/es.csv
@@ -0,0 +1,72 @@
+0$0 milisegundos
+1$1 milisegundo
+2$2 milisegundos
+5$5 milisegundos
+12$12 milisegundos
+420$420 milisegundos
+500$500 milisegundos
+1000$1 segundo
+1500$1 segundo+500 milisegundos
+2000$2 segundos
+2500$2 segundos+500 milisegundos
+3000$3 segundos
+1001$1 segundo+1 milisegundo
+1002$1 segundo+2 milisegundos
+2001$2 segundos+1 milisegundo
+2003$2 segundos+3 milisegundos
+1200$1 segundo+200 milisegundos
+6900$6 segundos+900 milisegundos
+30000$30 segundos
+60000$1 minuto
+90000$1 minuto+30 segundos
+120000$2 minutos
+150000$2 minutos+30 segundos
+180000$3 minutos
+61000$1 minuto+1 segundo
+78000$1 minuto+18 segundos
+61001$1 minuto+1 segundo+1 milisegundo
+61005$1 minuto+1 segundo+5 milisegundos
+62001$1 minuto+2 segundos+1 milisegundo
+62005$1 minuto+2 segundos+5 milisegundos
+121001$2 minutos+1 segundo+1 milisegundo
+121007$2 minutos+1 segundo+7 milisegundos
+138001$2 minutos+18 segundos+1 milisegundo
+138006$2 minutos+18 segundos+6 milisegundos
+1800000$30 minutos
+3600000$1 hora
+5400000$1 hora+30 minutos
+7200000$2 horas
+9000000$2 horas+30 minutos
+10800000$3 horas
+3660000$1 hora+1 minuto
+3720000$1 hora+2 minutos
+10860000$3 horas+1 minuto
+11040000$3 horas+4 minutos
+43200000$12 horas
+86400000$1 día
+129600000$1 día+12 horas
+172800000$2 días
+216000000$2 días+12 horas
+259200000$3 días
+302400000$3 días+12 horas
+604800000$1 semana
+907200000$1 semana+3 días+12 horas
+1209600000$2 semanas
+1512000000$2 semanas+3 días+12 horas
+1814400000$3 semanas
+1314900000$2 semanas+1 día+5 horas+15 minutos
+2629800000$1 mes
+3944700000$1 mes+2 semanas+1 día+5 horas+15 minutos
+5259600000$2 meses
+6574500000$2 meses+2 semanas+1 día+5 horas+15 minutos
+7889400000$3 meses
+15778800000$6 meses
+31557600000$1 año
+47336400000$1 año+6 meses
+63115200000$2 años
+78894000000$2 años+6 meses
+94672800000$3 años
+-420$420 milisegundos
+0.12$0,12 milisegundos
+1.5$1,5 milisegundos
+420.69$420,69 milisegundos
diff --git a/test/definitions/fr.csv b/test/definitions/fr.csv
new file mode 100644
index 0000000..f96e62e
--- /dev/null
+++ b/test/definitions/fr.csv
@@ -0,0 +1,72 @@
+0$0 milliseconde
+1$1 milliseconde
+2$2 millisecondes
+5$5 millisecondes
+12$12 millisecondes
+420$420 millisecondes
+500$500 millisecondes
+1000$1 seconde
+1500$1 seconde+500 millisecondes
+2000$2 secondes
+2500$2 secondes+500 millisecondes
+3000$3 secondes
+1001$1 seconde+1 milliseconde
+1002$1 seconde+2 millisecondes
+2001$2 secondes+1 milliseconde
+2003$2 secondes+3 millisecondes
+1200$1 seconde+200 millisecondes
+6900$6 secondes+900 millisecondes
+30000$30 secondes
+60000$1 minute
+90000$1 minute+30 secondes
+120000$2 minutes
+150000$2 minutes+30 secondes
+180000$3 minutes
+61000$1 minute+1 seconde
+78000$1 minute+18 secondes
+61001$1 minute+1 seconde+1 milliseconde
+61005$1 minute+1 seconde+5 millisecondes
+62001$1 minute+2 secondes+1 milliseconde
+62005$1 minute+2 secondes+5 millisecondes
+121001$2 minutes+1 seconde+1 milliseconde
+121007$2 minutes+1 seconde+7 millisecondes
+138001$2 minutes+18 secondes+1 milliseconde
+138006$2 minutes+18 secondes+6 millisecondes
+1800000$30 minutes
+3600000$1 heure
+5400000$1 heure+30 minutes
+7200000$2 heures
+9000000$2 heures+30 minutes
+10800000$3 heures
+3660000$1 heure+1 minute
+3720000$1 heure+2 minutes
+10860000$3 heures+1 minute
+11040000$3 heures+4 minutes
+43200000$12 heures
+86400000$1 jour
+129600000$1 jour+12 heures
+172800000$2 jours
+216000000$2 jours+12 heures
+259200000$3 jours
+302400000$3 jours+12 heures
+604800000$1 semaine
+907200000$1 semaine+3 jours+12 heures
+1209600000$2 semaines
+1512000000$2 semaines+3 jours+12 heures
+1814400000$3 semaines
+1314900000$2 semaines+1 jour+5 heures+15 minutes
+2629800000$1 mois
+3944700000$1 mois+2 semaines+1 jour+5 heures+15 minutes
+5259600000$2 mois
+6574500000$2 mois+2 semaines+1 jour+5 heures+15 minutes
+7889400000$3 mois
+15778800000$6 mois
+31557600000$1 an
+47336400000$1 an+6 mois
+63115200000$2 ans
+78894000000$2 ans+6 mois
+94672800000$3 ans
+-420$420 millisecondes
+0.12$0,12 milliseconde
+1.5$1,5 milliseconde
+420.69$420,69 millisecondes
diff --git a/test/definitions/it.csv b/test/definitions/it.csv
new file mode 100644
index 0000000..19552bf
--- /dev/null
+++ b/test/definitions/it.csv
@@ -0,0 +1,72 @@
+0$0 millisecondi
+1$1 millisecondo
+2$2 millisecondi
+5$5 millisecondi
+12$12 millisecondi
+420$420 millisecondi
+500$500 millisecondi
+1000$1 secondo
+1500$1 secondo+500 millisecondi
+2000$2 secondi
+2500$2 secondi+500 millisecondi
+3000$3 secondi
+1001$1 secondo+1 millisecondo
+1002$1 secondo+2 millisecondi
+2001$2 secondi+1 millisecondo
+2003$2 secondi+3 millisecondi
+1200$1 secondo+200 millisecondi
+6900$6 secondi+900 millisecondi
+30000$30 secondi
+60000$1 minuto
+90000$1 minuto+30 secondi
+120000$2 minuti
+150000$2 minuti+30 secondi
+180000$3 minuti
+61000$1 minuto+1 secondo
+78000$1 minuto+18 secondi
+61001$1 minuto+1 secondo+1 millisecondo
+61005$1 minuto+1 secondo+5 millisecondi
+62001$1 minuto+2 secondi+1 millisecondo
+62005$1 minuto+2 secondi+5 millisecondi
+121001$2 minuti+1 secondo+1 millisecondo
+121007$2 minuti+1 secondo+7 millisecondi
+138001$2 minuti+18 secondi+1 millisecondo
+138006$2 minuti+18 secondi+6 millisecondi
+1800000$30 minuti
+3600000$1 ora
+5400000$1 ora+30 minuti
+7200000$2 ore
+9000000$2 ore+30 minuti
+10800000$3 ore
+3660000$1 ora+1 minuto
+3720000$1 ora+2 minuti
+10860000$3 ore+1 minuto
+11040000$3 ore+4 minuti
+43200000$12 ore
+86400000$1 giorno
+129600000$1 giorno+12 ore
+172800000$2 giorni
+216000000$2 giorni+12 ore
+259200000$3 giorni
+302400000$3 giorni+12 ore
+604800000$1 settimana
+907200000$1 settimana+3 giorni+12 ore
+1209600000$2 settimane
+1512000000$2 settimane+3 giorni+12 ore
+1814400000$3 settimane
+1314900000$2 settimane+1 giorno+5 ore+15 minuti
+2629800000$1 mese
+3944700000$1 mese+2 settimane+1 giorno+5 ore+15 minuti
+5259600000$2 mesi
+6574500000$2 mesi+2 settimane+1 giorno+5 ore+15 minuti
+7889400000$3 mesi
+15778800000$6 mesi
+31557600000$1 anno
+47336400000$1 anno+6 mesi
+63115200000$2 anni
+78894000000$2 anni+6 mesi
+94672800000$3 anni
+-420$420 millisecondi
+0.12$0,12 millisecondi
+1.5$1,5 millisecondi
+420.69$420,69 millisecondi
diff --git a/test/definitions/nl.csv b/test/definitions/nl.csv
new file mode 100644
index 0000000..5316fff
--- /dev/null
+++ b/test/definitions/nl.csv
@@ -0,0 +1,72 @@
+0$0 milliseconden
+1$1 milliseconde
+2$2 milliseconden
+5$5 milliseconden
+12$12 milliseconden
+420$420 milliseconden
+500$500 milliseconden
+1000$1 seconde
+1500$1 seconde+500 milliseconden
+2000$2 seconden
+2500$2 seconden+500 milliseconden
+3000$3 seconden
+1001$1 seconde+1 milliseconde
+1002$1 seconde+2 milliseconden
+2001$2 seconden+1 milliseconde
+2003$2 seconden+3 milliseconden
+1200$1 seconde+200 milliseconden
+6900$6 seconden+900 milliseconden
+30000$30 seconden
+60000$1 minuut
+90000$1 minuut+30 seconden
+120000$2 minuten
+150000$2 minuten+30 seconden
+180000$3 minuten
+61000$1 minuut+1 seconde
+78000$1 minuut+18 seconden
+61001$1 minuut+1 seconde+1 milliseconde
+61005$1 minuut+1 seconde+5 milliseconden
+62001$1 minuut+2 seconden+1 milliseconde
+62005$1 minuut+2 seconden+5 milliseconden
+121001$2 minuten+1 seconde+1 milliseconde
+121007$2 minuten+1 seconde+7 milliseconden
+138001$2 minuten+18 seconden+1 milliseconde
+138006$2 minuten+18 seconden+6 milliseconden
+1800000$30 minuten
+3600000$1 uur
+5400000$1 uur+30 minuten
+7200000$2 uur
+9000000$2 uur+30 minuten
+10800000$3 uur
+3660000$1 uur+1 minuut
+3720000$1 uur+2 minuten
+10860000$3 uur+1 minuut
+11040000$3 uur+4 minuten
+43200000$12 uur
+86400000$1 dag
+129600000$1 dag+12 uur
+172800000$2 dagen
+216000000$2 dagen+12 uur
+259200000$3 dagen
+302400000$3 dagen+12 uur
+604800000$1 week
+907200000$1 week+3 dagen+12 uur
+1209600000$2 weken
+1512000000$2 weken+3 dagen+12 uur
+1814400000$3 weken
+1314900000$2 weken+1 dag+5 uur+15 minuten
+2629800000$1 maand
+3944700000$1 maand+2 weken+1 dag+5 uur+15 minuten
+5259600000$2 maanden
+6574500000$2 maanden+2 weken+1 dag+5 uur+15 minuten
+7889400000$3 maanden
+15778800000$6 maanden
+31557600000$1 jaar
+47336400000$1 jaar+6 maanden
+63115200000$2 jaar
+78894000000$2 jaar+6 maanden
+94672800000$3 jaar
+-420$420 milliseconden
+0.12$0,12 milliseconden
+1.5$1,5 milliseconden
+420.69$420,69 milliseconden