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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.
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Acting against or in opposition:
References in periodicals archive ?
A summary of his time at the hospital, provided to the inquest by consultant forensic psychiatrist for Mersey Care Dr Noir Thomas, painted a picture of an oppositional patient whose psychological traits made life difficult for those who had to deal with him.
The oppositional coalition will sign the document when they meet with the Chief mediator for Sudan-South Sudan peace talks, Ex-South Africa President Thabo Mbeki in Addis Ababa or Johannesburg soon, Sudan Appeal leaders said during a press conference in the Sudanese capital Monday.
Eventually, persistent patterns of these oppositional tendencies and conduct problems may exceed the threshold for a diagnostic of Oppositional-Defiant Disorder and/or Conduct Disorder (American Psychiatric Association 2013).
Last January, a delegation of various oppositional entities has arrived in Cairo on Tuesday in preparation for their meeting in Cairo, one day after the National Coalition of Syrian Revolution arrival.
These three examples reveal an oppositional mode of thinking, a dichotomous framework that defines reality and identities in mutually exclusive terms, which Keating troubles in Transformation Now\.
17% considered them selves Oppositional Drivers, 56% opted for the Defensive Driving category and 26% chose Supportive Driving as the criteria that best fitted them.
The Behavior Code Companion: Strategies, Tools, and Interventions for Supporting Students With Anxiety-Related or Oppositional Behaviors
Representatives of the four oppositional parliamentary parties (Armenian National Congress, Heritage, ARFD, Prosperous
During the 22 weeks of the study, children who received telemental health (TMH) improved significantly in ADHD inattention and hyperactivity, oppositional defiant disorder, school performance, and adaptive functioning, based on the ratings provided by their parents.
Oppositional defiant disorder (ODD) involves patterns of negativistic, defiant, disobedient, and hostile behavior toward authority figures that last for at least 6 months (American Psychiatric Association [APA], 2013).
The present study aimed at investigating the relationship of parenting styles with oppositional behaviour of school going children.
Of particular concern to early childhood personnel are children who exhibit oppositional defiant behaviour or who have been diagnosed as having Oppositional Defiant Disorder.