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) = x2 for every integer.
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."