Strong's #1722: en (pronounced en)
 a primary preposition denoting (fixed) position (in place, time or state), and (by implication) instrumentality (medially or constructively), i.e. a relation of rest (intermediate between 1519 and 1537); "in," at, (up-)on, by, etc.:--about, after, against, + almost, X altogether, among, X as, at, before, between, (here-)by (+ all means), for (... sake of), + give self wholly to, (here-)in(-to, -wardly), X mightily, (because) of, (up-)on, (open-)ly, X outwardly, one, X quickly, X shortly, (speedi-)ly, X that, X there(-in, -on), through(-out), (un-)to(-ward), under, when, where(-with), while, with(-in). Often used in compounds, with substantially the same import; rarely with verbs of motion, and then not to indicate direction, except (elliptically) by a separate (and different) preposition.
Thayer's Greek Lexicon:
 ̓ 
 
  en 
 
 1) in, by, with etc.
 
  Part of Speech: preposition
Relation: a primary preposition denoting (fixed) position (in place, time or state), and (by implication) instrumentality (medially or constructively), i.e. a relation of rest (intermediate between G1519 and G1537)
  Citing in TDNT: 2:537, 233
 
Usage:
This word is used 2731 times:
Luke 1:36: "hath also conceived a son  in her old age: and this"
Luke 1:39: "And Mary arose  in those days, and went into"
Luke 1:41: "the babe leaped  in her womb; and Elisabeth"
Luke 1:42: "said, Blessed art thou  among women, and blessed is the"
Luke 1:44: "the babe leaped  in my womb for joy."
Luke 1:44: "in my womb  for joy."
Luke 1:51: "He hath showed strength  with his arm; he hath scattered the proud in the imagination"
Luke 1:59: "And it came to pass,  that on the eighth day they came to circumcise"
Luke 1:61: "her, There is none  of thy kindred that is called"
Luke 1:65: "these sayings were noised abroad  throughout all the hill country of Judea."
Luke 1:66: "all they that heard them laid them up  in their hearts, saying, What manner"
Luke 1:69: "a horn of salvation for us  in the house of his servant"
Luke 1:75: " In holiness and righteousness before him, all the"
Luke 1:77: "of salvation unto his people  by the remission of their sins,"
Luke 1:78: "the tender mercy of our God;  whereby the dayspring from"
Luke 1:79: "To give light to them that sit  in darkness and in the shadow of death, to guide"
Luke 1:80: "in spirit, and was  in the deserts till the day"
Luke 2:1: "And it came to pass  in those days, that there went out a decree from"
Luke 2:7: "wrapped him in swaddling clothes, and laid him  in a manger; because there was"
Luke 2:7: "there was no room for them  in the inn."
Luke 2:8: "And there were  in the same country shepherds abiding in"
Luke 2:11: "unto you is born this day  in the city of David a Savior, which"
Luke 2:12: "the babe wrapped in swaddling clothes, lying  in a manger."
Luke 2:14: "Glory to God  in the highest, and on earth peace,"
Luke 2:14: "earth peace, good will  toward men."
Luke 2:16: "the babe lying  in a manger."
Luke 2:19: "these things, and pondered  them in her heart."
Luke 2:21: "before he was conceived  in the womb."
Luke 2:23: "(As it is written  in the law of the Lord, Every male that openeth"
Luke 2:24: "a sacrifice according to that which is said  in the law of the Lord, A pair of turtledoves,"
Luke 2:25: "behold, there was a man  in Jerusalem, whose name was Simeon;"
Luke 2:27: "And he came  by the Spirit into the temple:"
Luke 2:29: "lettest thou thy servant depart  in peace, according to thy word:"
Luke 2:34: "and rising again of many  in Israel; and for a sign"
Luke 2:36: "the tribe of Asher: she  was of a great age, and had lived"
Luke 2:38: "him to all them that looked for redemption  in Jerusalem."
Luke 2:43: "child Jesus tarried behind  in Jerusalem; and Joseph and"
Luke 2:44: "they, supposing him to have been  in the company, went a day's"
Luke 2:44: "and they sought him  among their kinsfolk and acquaintance."
Luke 2:44: "him among their kinsfolk  and acquaintance."
Luke 2:46: "days they found him  in the temple, sitting in"
Luke 2:46: "the temple, sitting  in the midst of the doctors, both"
Luke 2:49: "I must be  about my Father's business?"
Luke 2:51: "all these sayings  in her heart."
Luke 3:1: "Now  in the fifteenth year of the reign of Tiberius Caesar,"
Luke 3:4: "As it is written  in the book of the words of Isaiah the prophet,"
Luke 3:4: "saying, The voice of one crying  in the wilderness, Prepare ye the"
Luke 3:8: "begin not to say  within yourselves, We have Abraham to our father:"
Luke 3:15: "and all men mused  in their hearts of John,"
Luke 3:16: "he shall baptize you  with the Holy Ghost and with fire:"