oppositional

op•po•si•tion /ˌɑpəˈzɪʃən/USA pronunciation n.

[uncountable] the action of opposing.
[countable;
usually singular;
usually: the + ~] a person or group of people opposing something or someone.
Government[countable;
usually singular;
sometimes: the Opposition] the major political party opposed to the party in power and seeking to replace it.

See -pos-.

op•po•si•tion (op′ə zish′ən),USA pronunciation n.

the action of opposing, resisting, or combating.
antagonism or hostility.
a person or group of people opposing, criticizing, or protesting something, someone, or another group.
Government(sometimes cap.) the major political party opposed to the party in power and seeking to replace it.
the act of placing opposite, or the state or position of being placed opposite.
the act of opposing, or the state of being opposed by way of comparison or contrast.
[Logic.]
- Philosophythe relation between two propositions that have the same subject and predicate, but which differ in quantity or quality, or in both.
- Philosophythe relation between two propositions in virtue of which the truth or falsity of one of them determines the truth or falsity of the other.
Astronomythe situation of two heavenly bodies when their longitudes or right ascensions differ by 180°:The moon is in opposition to the sun when the earth is directly between them.
Astrologythe situation of two heavenly bodies or groups of heavenly bodies whose celestial longitudes differ by 180°, conducive to confrontation or revelation: an astrological aspect.
[Elect.]the condition that exists when two waves of the same frequency are out of phase by one-half of a period.
Linguistics
- the relationship between any two alternative units within a linguistic system, esp. between minimally distinct phonemes.
- the feature that constitutes the difference between two such units.

Latin as above
Old French opposicion
Latin oppositiōn- (stem of oppositiō), equivalent. to opposit(us) (see opposite) + -iōn- -ion; replacing Middle English opposicioun
1350–1400

op′po•si′tion•al, op′po•si′tion•ar′y, adj.
op′po•si′tion•less, adj.

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