Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Placed or located directly across from something else or from each other: opposite sides of a building.
  • adj. Facing the other way; moving or tending away from each other: opposite directions.
  • adj. Being the other of two complementary or mutually exclusive things: the opposite sex; an opposite role to the lead in the play.
  • adj. Altogether different, as in nature, quality, or significance: The effect of the medication was opposite to that intended.
  • adj. Sharply contrasting; antithetical: had opposite views on the subject.
  • adj. Botany Growing in pairs on either side of a stem: opposite leaves.
  • n. One that is opposite or contrary to another.
  • n. An opponent or antagonist.
  • n. An antonym.
  • adv. In an opposite position: They sat opposite at the table.
  • prep. Across from or facing: parked the car opposite the bank.
  • prep. In a complementary dramatic role to: He played opposite her.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Located directly across from something else, or from each other.
  • adj. Facing in the other direction.
  • adj. Of either of two complementary or mutually exclusive things.
  • n. Something opposite or contrary to another.
  • n. An opponent.
  • n. An antonym.
  • n. An additive inverse.
  • adv. In an opposite position.
  • prep. Facing, or across from.
  • prep. In a complementary role to.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Placed over against; standing or situated over against or in front; facing; -- often with to.
  • adj. Situated on the other end of an imaginary line passing through or near the middle of an intervening space or object; -- of one object with respect to another; -- also used both to describe two objects with respect to each other.
  • adj. Applied to the other of two things which are entirely different; other
  • adj. Extremely different; inconsistent; contrary; repugnant; antagonistic.
  • adj.
  • adj. Set over against each other, but separated by the whole diameter of the stem, as two leaves at the same node.
  • adj. Placed directly in front of another part or organ, as a stamen which stands before a petal.
  • n. One who opposes; an opponent; an antagonist.
  • n. That which is opposed or contrary in character or meaning.

from The Century Dictionary and Cyclopedia

  • That forms or is situated in or on the other or further side, end, or boundary of an interval, space, or thing; placed over against or face to face with (another or one another): literally or figuratively: as, the opposite side of the street or square; the opposite door; an opposite angle.
  • Contrary; reverse.
  • Of a totally or radically different nature, quality, or tendency; also (of two persons or things), mutually antagonistic or repugnant; mutually opposed in character or action; contradictory; non-congruent: as, words of opposite meaning; opposite terms.
  • Adverse; opposed; hostile; antagonistic; inimical.
  • In botany: Situated on opposite sides of an axis, as leaves when there are two on one node.
  • Having a position between an organ and the axis on which it is borne, as a stamen when it is opposite a sepal or petal. In both senses opposed to alternate.
  • n. One who opposes or is adverse; an opponent; an adversary; an enemy; an antagonist.
  • n. That which opposes; that which is opposed or is opposite; a complement in characteristic qualities or properties; specifically, as a logical term, anything contrasted with another in any sense.
  • n. [Some modern writers on logic wish to call any two different species of the same genus opposites. This practice has little to recommend it.]
  • In gcom., in any complete set of connectors or fans, said of the first and the (n /2+l)th, when n is even.
  • n. In geometry, an opposite point.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. altogether different in nature or quality or significance
  • adj. of leaves etc; growing in pairs on either side of a stem
  • adj. characterized by opposite extremes; completely opposed
  • n. something inverted in sequence or character or effect
  • adv. directly facing each other
  • adj. the other one of a complementary pair
  • n. a contestant that you are matched against
  • n. a relation of direct opposition
  • adj. moving or facing away from each other
  • n. a word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other
  • adj. being directly across from each other; facing

Etymologies

Middle English, from Old French, from Latin oppositus, past participle of oppōnere, oppose; see oppose.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin oppositus, perfect passive participle of oppōnō ("I oppose"). (Wiktionary)

Examples

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