Strong's #3752: hotan (pronounced hot'-an)
 from 3753 and 302; whenever (implying hypothesis or more or less uncertainty); also causatively (conjunctionally) inasmuch as:--as long (soon) as, that, + till, when(-soever), while.
Thayer's Greek Lexicon:
 ̔́ 
 
  hotan 
 
 1) when, whenever, as long as, as soon as
 
  Part of Speech: particle
Relation: from G3753 and G302
 
Usage:
This word is used 125 times:
Matthew 5:11: "Blessed are  ye, when men shall revile you, and persecute you, and"
Matthew 6:2: "Therefore  when thou doest thine alms, do not sound a trumpet before thee,"
Matthew 6:5: "And  when thou prayest, thou shalt not be as the hypocrites"
Matthew 6:6: "But thou,  when thou prayest, enter into thy closet,"
Matthew 6:16: "Moreover  when ye fast, be not, as the hypocrites,"
Matthew 9:15: "with them? but the days will come,  when the bridegroom"
Matthew 10:19: "But  when they deliver you up, take no thought how or"
Matthew 10:23: "But  when they persecute you in this city, flee"
Matthew 12:43: " When the unclean spirit is gone out of a man, he walketh"
Matthew 13:32: "of all seeds: but  when it is grown, it is the greatest among herbs,"
Matthew 15:2: "not their hands  when they eat bread."
Matthew 16:20: "that they should tell no man  that he was Jesus the"
Matthew 19:28: "in the regeneration  when the Son of man shall sit"
Matthew 21:40: " When the lord therefore of the vineyard cometh, what"
Matthew 23:15: "one proselyte, and  when he is made, ye make him twofold more"
Matthew 24:15: " When ye therefore shall see the abomination of desolation, spoken of by"
Matthew 24:32: "of the fig tree;  When his branch is yet"
Matthew 24:33: "So likewise ye,  when ye shall see all these things, know"
Matthew 25:31: " When the Son of man shall come in his glory,"
Matthew 26:29: "vine, until that day  when I drink it new"
Mark 2:20: "But the days will come,  when the bridegroom shall be taken away from"
Mark 3:11: "And unclean spirits,  when they saw him, fell down before him,"
Mark 4:15: "word is sown; but  when they have heard, Satan cometh immediately,"
Mark 4:16: "they likewise which are sown on stony ground; who,  when they have heard the word,"
Mark 4:29: "But  when the fruit is brought forth, immediately he putteth in the"
Mark 4:31: "a grain of mustard seed, which,  when it is sown in the earth,"
Mark 4:32: "But  when it is sown, it groweth up, and becometh greater than all"
Mark 8:38: "shall the Son of man be ashamed,  when he cometh in the"
Mark 9:9: "no man what things they had seen,  till the Son of man"
Mark 11:25: "And  when ye stand praying, forgive, if ye have aught"
Mark 12:23: "the resurrection therefore,  when they shall rise, whose wife shall she be"
Mark 12:25: "For  when they shall rise from the dead, they neither marry, nor"
Mark 13:4: "what shall be the sign  when all these things shall be fulfilled?"
Mark 13:7: "And  when ye shall hear of wars and rumors of wars, be ye not"
Mark 13:11: "But  when they shall lead you, and deliver you up, take no thought beforehand what"
Mark 13:14: "But  when ye shall see the abomination of desolation, spoken of by"
Mark 13:28: "of the fig tree;  When her branch is yet"
Mark 13:29: "So ye in like manner,  when ye shall see these things come to pass, know"
Mark 14:7: "you always, and  whensoever ye will ye may do them"
Mark 14:25: "until that day  that I drink it new in"
Luke 5:35: "the days will come,  when the bridegroom shall be taken away from"
Luke 6:22: "Blessed are  ye, when men shall hate you, and when"
Luke 6:22: "shall hate you, and  when they shall separate you from their company, and shall reproach"
Luke 6:26: "Woe unto you,  when all men shall speak well of you!"
Luke 8:13: "the rock are they, which,  when they hear, receive the word"
Luke 9:26: "shall the Son of man be ashamed,  when he shall come in his own"
Luke 11:2: "And he said unto them,  When ye pray, say, Our Father"
Luke 11:21: " When a strong man armed keepeth his palace, his goods"
Luke 11:24: " When the unclean spirit is gone out of a man, he walketh"
Luke 11:34: "the eye: therefore  when thine eye is single,"