Strong's G5148 · Greek

τριετία

trietia · tree-et-ee'-ah

from a compound of 5140 and 2094; a three years' period (triennium)

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 1 * τριετία , -ας, ἡ ( τρεῖς , ἔτος ), a period of three years : Ac 20:31 .† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain