Definition of: into

(in′t) prep.
1. To or toward the inside of; penetrating or entering within: Come into the house.
2. Extending within (a period of time): talking well into the night.
3. So as to become: Boiling changes water into steam.
4. Math. Dividing: Two into six is three.
5. As an addition to: into the bargain.
6. In the direction of: into the northwest.
7. To the practice or study of: to go into medicine.
8. Slang Actively engaged or involved with, as an interest or enthusiasm: He's into oriental religion. [OE] Synonyms: in, to. Into is the preposition of tendency, direction, destination, etc.; in is that of condition, state, position, or situation. Into should be used and not in, when entrance or insertion is intended; into indicates motion, change, entrance, in a more marked degree than in. “I throw the stone into the water, and it lies in the water.” Used adverbially in follows verbs of motion, as come, go, walk, and such use has established certain phrases as idioms. One says, “Come in the house” but the preferred expression is “Come into the house.” Where no object is expressed, we say “come in,” “go in.” Antonyms: beyond, by, from, out, past, through.