τριετία G5148
trietía · tree-et-ee'-ah · Noun Feminine
from a compound of τρεῖς and ἔτος; a three years' period (triennium):--space of three years.
1 Occurrence in the King James Bible
Acts 20:31Therefore watch, and remember, that by the space of three years I ceased not to warn every one night and day with tears.