Strong's #1875: epan (pronounced ep-an')

from 1909 and 302; a particle of indefinite contemporaneousness; whenever, as soon as:--when.

Thayer's Greek Lexicon:

̓́

epan

1) after, when

Part of Speech: conjunction

Relation: from G1909 and G302

Usage:

This word is used 3 times:

 

Matthew 2:8: "the young child; and when ye have found him, bring me word again, that"
Luke 11:22: "But when a stronger than he shall come upon him, and overcome him, he taketh"
Luke 11:34: "is full of light; but when thine eye is evil, thy body"