1. Noun

   versus; against; vs.; v.

   今日早稲田対慶応の試合がある。

2. to (e.g. score of 4 to 2, ratio of 3 to 1, vote of 320 to 180)

   used between numbers

3. Noun, used as a prefix

   toward ...; to ...; with ...; against ...; anti-

4. Noun

   equal footing; equal terms

5. opposite

Also written 對【たい】tai