[in-too; unstressed in-too, -tuh]
See more synonyms for into on
  1. to the inside of; in toward: He walked into the room. The train chugged into the station.
  2. toward or in the direction of: going into town.
  3. to a point of contact with; against: backed into a parked car.
  4. (used to indicate insertion or immersion in): plugged into the socket.
  5. (used to indicate entry, inclusion, or introduction in a place or condition): received into the church.
  6. to the state, condition, or form assumed or brought about: went into shock; lapsed into disrepair; translated into another language.
  7. to the occupation, action, possession, circumstance, or acceptance of: went into banking; coerced into complying.
  8. (used to indicate a continuing extent in time or space): lasted into the night; far into the distance.
  9. (used to indicate the number to be divided by another number): 2 into 20 equals 10.
  10. Informal. interested or absorbed in, especially obsessively: She's into yoga and gardening.
  11. Slang. in debt to: I'm into him for ten dollars.
  1. 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) = x2 for every integer.

Origin of into

before 1000; Middle English, Old English; see in, to Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for into

toward, within

British Dictionary definitions for into


  1. to the interior or inner parts ofto look into a case
  2. to the middle or midst of so as to be surrounded byinto the water; into the bushes
  3. against; up againsthe drove into a wall
  4. used to indicate the result of a transformation or changehe changed into a monster
  5. maths used to indicate a dividendthree into six is two
  6. informal interested or enthusiastically involved inI'm really into Freud these days
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for into

Old English into, originally in to. The word is a late Old English development to replace the fading dative case inflections that formerly distinguished, for instance, "in the house" from "into the house." To be into something, "be intensely involved in," first recorded 1969 in American English.

Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with into


In addition to the idioms beginning with into

  • into account
  • into effect
  • into line
  • into one's head
  • into question
  • into the bargain
  • into the blue
  • into the drink
  • into thin air

also see:

  • be into
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.