[in-too; unstressed in-too, -tuh]
to the inside of; in toward: He walked into the room. The train chugged into the station.
toward or in the direction of: going into town.
to a point of contact with; against: backed into a parked car.
(used to indicate insertion or immersion in): plugged into the socket.
(used to indicate entry, inclusion, or introduction in a place or condition): received into the church.
to the state, condition, or form assumed or brought about: went into shock; lapsed into disrepair; translated into another language.
to the occupation, action, possession, circumstance, or acceptance of: went into banking; coerced into complying.
(used to indicate a continuing extent in time or space): lasted into the night; far into the distance.
(used to indicate the number to be divided by another number): 2 into 20 equals 10.
Informal. interested or absorbed in, especially obsessively: She's into yoga and gardening.
Slang. in debt to: I'm into him for ten dollars.
Mathematics. pertaining to a function or map from one set to another set, the range of which is a proper subset of the second set, as the function f, from the set of all integers into the set of all perfect squares where f (x ) = x 2 for every integer.

before 1000; Middle English, Old English; see in, to Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
into (ˈɪntuː, (unstressed) ˈɪntə)
1.  to the interior or inner parts of: to look into a case
2.  to the middle or midst of so as to be surrounded by: into the water; into the bushes
3.  against; up against: he drove into a wall
4.  used to indicate the result of a transformation or change: he changed into a monster
5.  maths used to indicate a dividend: three into six is two
6.  informal interested or enthusiastically involved in: I'm really into Freud these days

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. into, originally in to. To be into something, "be intensely involved in," first recorded 1969 in Amer.Eng. The word is a late O.E. development to replace the fading dative case inflections that formerly distinguished, for instance, "in the house" from "into the house."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
How wonderful the thought of being able to go in to an establishment and be
  able to hear the sounds from the local musicians.
They threw food at her and never went in to clean the cage because they were
  afraid of her.
It may have only one or two sacral attachments or be inserted in to the capsule
  of the hip-joint.
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