Strong's #1492: eido (pronounced i'-do)
 a primary verb; used only in certain past tenses, the others being borrowed from the equivalent 3700 and 3708; properly, to see (literally or figuratively); by implication, (in the perfect tense only) to know:--be aware, behold, X can (+ not tell), consider, (have) know(-ledge), look (on), perceive, see, be sure, tell, understand, wish, wot. Compare 3700.
Thayer's Greek Lexicon:
 ̓́ 
 
  eidō 
 
 1) to see
 
 1a) to perceive with the eyes
 1b) to perceive by any of the senses
 1c) to perceive, notice, discern, discover
 1d) to see
 
 1d1) i.e. to turn the eyes, the mind, the attention to anything
 1d2) to pay attention, observe
 1d3) to see about something
 
 1d3a) i.e. to ascertain what must be done about it
 
 1d4) to inspect, examine
 1d5) to look at, behold
 
 1e) to experience any state or condition
 1f) to see, i.e. have an interview with, to visit
 
 2) to know
 
 2a) to know of anything
 2b) to know, i.e. get knowledge of, understand, perceive
 
 2b1) of any fact
 2b2) the force and meaning of something which has definite meaning
 2b3) to know how, to be skilled in
 
 2c) to have regard for one, cherish, pay attention to (I Thessalonians 5:12)
 
  Part of Speech: verb
Relation: a root word
  Citing in TDNT: 5:116, 673
 
Usage:
This word is used 665 times:
Mark 5:32: "And he looked round about  to see her that had done this thing."
Mark 5:33: "fearing and trembling,  knowing what was done in her,"
Mark 6:20: "Herod feared John,  knowing that he was a just man and"
Mark 6:33: "And the people  saw them departing, and many"
Mark 6:34: "And Jesus, when he came out,  saw much people, and was moved with compassion"
Mark 6:38: "have ye? go and  see. And when they knew, they say, Five,"
Mark 6:48: "And  he saw them toiling in rowing; for the wind"
Mark 6:49: "But when they  saw him walking upon the sea,"
Mark 6:50: "For they all  saw him, and were troubled. And immediately"
Mark 7:2: "And  when they saw some of his disciples eat bread with defiled,"
Mark 8:33: "when he had turned about and  looked on his disciples, he rebuked Peter,"
Mark 9:1: "taste of death, till  they have seen the kingdom of God"
Mark 9:6: "For  he wist not what to say; for they were sore afraid."
Mark 9:8: "And suddenly, when they had looked round about,  they saw no man any more, save Jesus"
Mark 9:9: "they should tell no man what things  they had seen, till the Son"
Mark 9:14: "when he came to his disciples,  he saw a great multitude about them,"
Mark 9:15: "all the people,  when they beheld him, were greatly amazed, and running to him"
Mark 9:20: "unto him: and  when he saw him, straightway the spirit"
Mark 9:25: "When Jesus  saw that the people came running together, he rebuked the"
Mark 9:38: "him, saying, Master,  we saw one casting out devils in"
Mark 10:14: "But when Jesus  saw it, he was much displeased, and said unto them, Suffer"
Mark 10:19: " Thou knowest the commandments, Do not commit adultery, Do not kill, Do not"
Mark 10:38: "Jesus said unto them,  Ye know not what ye ask: can"
Mark 10:42: "them to him, and saith unto them,  Ye know that they which are accounted to rule over the"
Mark 11:13: "And  seeing a fig tree afar off having leaves, he came, if"
Mark 11:20: "And in the morning, as they passed by,  they saw the fig tree dried up from"
Mark 11:33: "they answered and said unto Jesus.  We cannot tell. And Jesus answering"
Mark 12:14: "they say unto him, Master,  we know that thou art true, and"
Mark 12:15: "give? But he,  knowing their hypocrisy, said unto them,"
Mark 12:15: "me a penny, that  I may see"
Mark 12:24: "Do ye not therefore err,  because ye know not the Scriptures,"
Mark 12:28: "and having heard them reasoning together,  and perceiving that he had answered them well,"
Mark 12:34: "And when Jesus  saw that he answered discreetly he said unto him,"
Mark 13:14: "But when  ye shall see the abomination of desolation, spoken of by"
Mark 13:29: "ye in like manner, when  ye shall see these things come to pass, know that"
Mark 13:32: "day and that hour  knoweth no man, no, not the angels"
Mark 13:33: "and pray: for  ye know not when the time"
Mark 13:35: "Watch ye therefore: for  ye know not when the master"
Mark 14:40: "were heavy,) neither  wist they what to answer him."
Mark 14:67: "And  when she saw Peter warming himself, she looked upon him, and said, And"
Mark 14:68: "he denied, saying,  I know not, neither understand I what"
Mark 14:69: "And a maid  saw him again, and began to say to them that stood by,"
Mark 14:71: "to curse and to swear,  saying, I know not this man of whom"
Mark 15:32: "the cross, that  we may see and believe. And they that were crucified with"
Mark 15:36: "and gave him to drink, saying, Let alone;  let us see whether Elijah"
Mark 15:39: "which stood over against him,  saw that he so cried out,"
Mark 16:5: "into the sepulcher,  they saw a young man sitting on the"
Luke 1:12: "And when Zacharias  saw him, he was troubled, and fear fell upon"
Luke 1:29: "And when she  saw him, she was troubled at his saying, and"
Luke 2:15: "Let us now go even unto Bethlehem, and  see this thing"