Abarim Publications' online Biblical Greek Dictionary
The noun ετος (etos) means year (Matthew 9:20, Luke 3:1, John 2:20). This word comes from an ancient root, and also exists in Sanskrit (as vatsa) and Hittite (as whitish). And since longer periods of time are commonly expressed in years, the Latin word veteranus, from whence comes the English "veteran", makes use of the same root.
This word also occurs in the New Testament as part of the following compounds:
- Together with the adverb δις (dis), which comes from the familiar cardinal number δυο (duo), two, and which means twice: the adjective διετης (dietes), meaning of two years [old] (Matthew 2:16 only). From this word comes:
- The noun διετια (dietia), meaning a period of two years (Acts 24:27 and 28:30 only).
- Together with the cardinal number εκατον (hekaton), meaning a hundred: the adjective εκατονταετης (hekatontaetes), meaning centenarian or of a hundred years [old] (Romans 4:19 only).
- Together with the cardinal number τεσσαρακοντα (tessarakonta), meaning forty: the adjective τεσσαρακονταετης (tessarakontaetes), meaning of forty years (Acts 7:23 and 13:18 only).
- In plural and together with the cardinal number τρεις (treis), meaning three: the noun τριετια (trietia), meaning three years (Acts 20:31 only).