Greek word · Strong's G1492

εἴδω

eídō · verb · “to know, see”

In a sentence

Oida is to know — settled, intuitive knowledge that just is, as opposed to ginōskō (knowledge gained by experience). Jesus knew (oida) what was in man.

Oida names knowledge that is settled, often inherent — knowing facts, knowing a person. John 21:17 records Peter's pleading words: «Lord, you know (oida) all things; you know that I love you.»

Greek has two verbs for «know» — oida (settled knowing) and ginōskō (experiential knowing). Translations flatten this; in John's Gospel especially, the distinction can carry weight.

Strong's reference

Definition: used only in certain past tenses, the others being borrowed from the equivalent G3700 (ὀπτάνομαι) and G3708 (ὁράω); properly, to see (literally or figuratively); by implication, (in the perfect tense only) to know

KJV usage: be aware, behold, X can (+ not tell), consider, (have) know(-ledge), look (on), perceive, see, be sure, tell, understand, wish, wot

Reference gloss from Strong's Concordance (1890, public domain).

Key verses BSB · Public Domain (CC0)

John 21:17 “Jesus asked a third time, “Simon son of John, do you love Me?” Peter was deeply hurt that Jesus had asked him a third time, “Do you love Me?” “Lord, You know all things,” he replied. “You know I love You.” Jesus said to him, “Feed My sheep.” John 2:25 “He did not need any testimony about man, for He knew what was in a man.”

Original BibleDawn word study. Original-language data and the public-domain Strong's (1890) gloss are referenced; see sources.