situated, placed, or lying face to face with something else or each other, or in corresponding positions with relation to an intervening line, space, or thing

opposite ends of a room.

contrary or radically different in some respect common to both, as in nature, qualities, direction, result, or significance; opposed

opposite sides in a controversy; opposite directions.

being the other of two related or corresponding things

friendly with many members of the opposite sex.

Botany .

situated on diametrically opposed sides of an axis, as leaves when there are two on one node.

having one organ vertically above another; superimposed.

adverse or inimical.

a person or thing that is opposite or contrary.

an antonym.

Archaic . an opponent; antagonist.

across from; facing

The guest of honor sat opposite me at the banquet.

in a role parallel or complementary to

He has played opposite many leading ladies.

on opposite sides.

on the opposite side

I was at one end and she sat opposite.

to the opposite side; in the opposite direction

I went to the left balcony, and he went opposite.