Noun

(en noun)

The action of opposing or of being in conflict.

An opposite or contrasting position.

An opponent in some form of competition.

* {{quote-magazine, date=2013-08-10, volume=408, issue=8848, magazine=(The Economist)

, title= Can China clean up fast enough? , passage=That worries the government, which fears that environmental activism could become the foundation for more general political opposition .}}

(astronomy) The apparent relative position of two celestial bodies when one is at an angle of 180 degrees from the other as seen from the Earth.

(senseid)(politics) A political party or movement opposed to the party or government in power.

(legal) In United States intellectual property law, a proceeding in which an interested party seeks to prevent the registration of a trademark or patent.

(chess) A position in which the player on the move must yield with his king allowing his opponent to advance with his own king.

Noun

(en noun)

The act of reserving, withholding or keeping back.

Something that is withheld or kept back.

A limiting qualification (often used in the plural).

I have reservations about your intentions.

(US) A tract of land set apart by the US government for the use of a Native American people; Indian reservation (compare Canadian (reserve)).

An arrangement by which accommodation or transport arrangements are secured in advance.

(UK) The area which separates opposing lanes of traffic on a divided motorway.

(India) The setting aside of a certain percentage of vacancies in government institutions for members of backward and underrepresented communities (defined primarily by caste and tribe).