1.
pair, couple, set of two
Two things that go together as a matching set.
対 refers to two things that form a matching pair or set. It's different from 二つ (two items) because it emphasizes that the items belong together.
COMMON USES:
- 対で: as a pair, in pairs
- 対の~: a pair of ~
- 対になる: to form a pair
SIMILAR WORDS:
- ペア: pair (loanword, often for people)
- 組: set, pair (also for people/things working together)
- 双子: twins
NOTE: As a prefix, 対~ means 'versus' or 'against' (e.g., 対日本 = versus Japan).