opposite (adj.)

late 14c., "placed or situated on the other side of (something)," from Old French opposite, oposite "opposite, contrary" (13c.), from Latin oppositus "standing against, opposed, opposite," past participle of opponere "set against," from assimilated form of ob "in front of, in the way of" (see ob-) + ponere "to put, set, place" (see position (n.)).

The meaning "contrary in character, of a totally different nature" is from 1570s. As a noun from late 14c., "the opposite side of" (a place, the body, etc.), "an opposite position or condition." From early 15c. as "that which is opposite in character or quality;" also "an opponent." As a preposition from 1758. As an adverb from 1817. Related: Oppositely.

Others are reading

Definitions of opposite from WordNet
opposite (adj.)
characterized by opposite extremes; completely opposed;
diametrical (or opposite) points of view
opposite meanings
Synonyms: diametric / diametrical / polar
opposite (adj.)
altogether different in nature or quality or significance; "it is said that opposite characters make a union happiest"- Charles Reade;
the medicine's effect was opposite to that intended
opposite (adj.)
at opposite poles
we lived on opposite sides of the street
opposite (adj.)
opposite leaves
Synonyms: paired
opposite (adj.)
moving or facing away from each other;
looking in opposite directions
they went in opposite directions
opposite (adj.)
the other one of a complementary pair;
the two chess kings are set up on squares of opposite colors
the opposite sex
opposite (n.)
Synonyms: antonym / opposite word
opposite (n.)
a relation of direct opposition;
Synonyms: reverse / contrary
opposite (n.)
a contestant that you are matched against;
Synonyms: opposition / opponent
opposite (n.)
something inverted in sequence or character or effect;
Synonyms: inverse
opposite (adv.)
directly facing each other;
they sat opposite at the table
Synonyms: face-to-face / face to face