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a. The act of opposing or resisting.
b. The condition of being in conflict; antagonism: "The history of men's opposition to women's emancipation is more interesting perhaps than the story of that emancipation itself" (Virginia Woolf).
2. Placement opposite to or in contrast with another.
3. Something that serves as an obstacle.
4. often Opposition A political party or an organized group opposed to the group, party, or government in power.
5. Astronomy
a. The position of two celestial objects when their longitude differs by 180°, especially a configuration in which the sun and a superior planet or the moon are on opposite sides of Earth.
b. The position of the superior planet or the moon in this configuration.
6. Logic The relation existing between two propositions having an identical subject and predicate but differing in quantity, quality, or both.
7. Linguistics Contrast in a language between two phonemes or other linguistically important elements.

op′po·si′tion·al adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Acting against or in opposition:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
In drawing attention to oppositional writing's dependence on the political system, he is able to make a virtue of its limits and to provide a salutary alternative to extant histories of the utopian and fantastical imaginations of radical culture.
Imagine the 30-year-old filmmaker of 2027, the very model of the well-adjusted 21st-century queer, who has grown up on a steady diet of gay cinematic images in a culture that caters its advertising to the gay pocketbook: It's unlikely that he will fashion his identity in the subversive oppositional style of late-20th-century gay cinema.
By young adulthood, this population has more academic problems and is more oppositional and delinquent than peer groups.
On the other hand, we of course know that a harmonious folk community of this kind can only be established by using force to suppress oppositional tendencies.
Researchers at Washington University School of Medicine have found that children with at least one alcoholic parent are at increased risk for oppositional and conduct disorders.
Reading (the) Oppositional (in) Narrative (Chicago: University of Chicago Press, 1991).
He concludes that Paul was not writing a polemical letter targeting specific opponents, but was using oppositional rhetoric to support his more broadly deliberative intent.
The meeting outcomes focused mainly on demanding a transitional process containing joint oppositional bodies, and abiding by the Geneva I communique adopted by the UN Security Council resolution No 2118/2013.
vote for candidate from the oppositional party Democratic Movement-United Georgia, the parliamentary ex-speaker Nino Burjanadze.
The difference in support for GERB and the oppositional Bulgarian Socialist Party, BSP, is now just 3%, according to the latest poll conducted by Gallup International.
SAN ANTONIO -- Many children with attention-deficit/hyperactivity disorder or oppositional defiant disorder no longer meet diagnostic criteria for these psychopathologies 6 months after they undergo adenotonsillectomy for standard indications, a large prospective patient series suggests.
On his travels, he meets Hugh, a 10-year-old who has been diagnosed with ADHD, Oppositional Defiant Disorder, Aspergers and Bipolar Disorder.