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:
Matthew 21:38: "But when the husbandmen  saw the son, they said among"
Matthew 22:11: "to see the guests,  he saw there a man which had not on"
Matthew 22:16: "Herodians, saying, Master,  we know that thou art true, and"
Matthew 22:29: "unto them, Ye do err, not  knowing the Scriptures, nor the"
Matthew 23:39: "I say unto you, Ye shall not  see me henceforth, till"
Matthew 24:15: "When ye therefore  shall see the abomination of desolation, spoken of by"
Matthew 24:33: "likewise ye, when  ye shall see all these things, know that"
Matthew 24:36: "day and hour  knoweth no man, no, not the angels"
Matthew 24:42: "Watch therefore: for  ye know not what hour your"
Matthew 24:43: "if the goodman of the house  had known in what watch the thief"
Matthew 25:12: "Verily I say unto you,  I know you not."
Matthew 25:13: "Watch therefore, for  ye know neither the day nor"
Matthew 25:26: "and slothful servant,  thou knewest that I reap where I sowed"
Matthew 25:37: "saying, Lord, when  saw we thee hungry, and fed"
Matthew 25:38: "When  saw we thee a stranger, and took thee in? or"
Matthew 25:39: "Or when  saw we thee sick, or in prison,"
Matthew 25:44: "saying, Lord, when  saw we thee hungry, or athirst,"
Matthew 26:2: " Ye know that after two days is the feast of the passover,"
Matthew 26:8: "But when his disciples  saw it, they had indignation, saying, To what purpose"
Matthew 26:58: "and sat with the servants,  to see the end."
Matthew 26:70: "before them all, saying,  I know not what thou sayest."
Matthew 26:71: "the porch, another  maid saw him, and said unto them"
Matthew 26:72: "with an oath, I do not  know the man."
Matthew 26:74: "he to curse and to swear,  saying, I know not the man. And"
Matthew 27:3: "Judas, which had betrayed him,  when he saw that he was condemned, repented himself, and brought again"
Matthew 27:18: "For  he knew that for envy they had delivered him."
Matthew 27:24: "When Pilate  saw that he could prevail nothing, but that rather"
Matthew 27:49: "rest said, Let be,  let us see whether Elijah will come to save"
Matthew 27:54: "him, watching Jesus,  saw the earthquake, and those things that were done,"
Matthew 27:65: "go your way, make it as sure as  ye can."
Matthew 28:5: "not ye: for  I know that ye seek Jesus, which was crucified."
Matthew 28:6: "as he said. Come,  see the place where the"
Matthew 28:17: "And  when they saw him, they worshiped him: but some doubted."
Mark 1:10: "out of the water,  he saw the heavens opened, and"
Mark 1:16: "the sea of Galilee,  he saw Simon and Andrew his"
Mark 1:19: "when he had gone a little farther thence,  he saw James the son of Zebedee, and"
Mark 1:24: "what have we to do with thee, thou Jesus of Nazareth? art thou come to destroy us?  I know thee"
Mark 1:34: "the devils to speak, because  they knew him."
Mark 2:5: "When Jesus  saw their faith, he said unto the sick of the palsy,"
Mark 2:10: "But that  ye may know that the Son of man hath"
Mark 2:12: "God, saying, We never  saw it on this fashion."
Mark 2:14: "And as he passed by,  he saw Levi the son of Alphaeus sitting at"
Mark 2:16: "scribes and Pharisees  saw him eat with publicans"
Mark 4:12: "they may see, and not  perceive; and hearing they may hear, and"
Mark 4:13: "And he said unto them,  Know ye not this parable? and"
Mark 4:27: "and grow up, he  knoweth not how."
Mark 5:6: "But  when he saw Jesus afar off, he ran and worshiped"
Mark 5:14: "country. And they went out  to see what it was that was done."
Mark 5:16: "And  they that saw it told them how it befell to him that was possessed with the devil, and"
Mark 5:22: "Jairus by name; and  when he saw him, he fell at his"