Opposition

Etymology
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Noun

 * 1)  the opposition, political opposition; opposition party
 * 2) a group opposed (to something or someone)
 * 3) opposition (the position of a planet in relation to the sun in positional astronomy)
 * 4)  In chess, when two kings face off against each other with only one square between them
 * 1)  In chess, when two kings face off against each other with only one square between them