1. versus; against; vs.; v.
これは、チーム対チームの戦いだからね?This is a team-versus-team battle, you know?
2. to (e.g. score of 4 to 2, ratio of 3 to 1, vote of 320 to 180)
used between numbers
ポイントは二対三。The score is two to three.
3. toward ...; to ...; with ...; against ...; anti-
この技って、対多数用の技なのね。So this technique is meant for fighting many opponents at once.
4. equal footing; equal terms
5. opposite