- Situated in front; opposite; hence, opposing; adverse;
antagonistic.
2 . Opponent
[ n.]
- One who opposes; an adversary; an antagonist; a foe. - One who opposes in a disputation, argument, or other
verbal controversy; specifically, one who attacks some theirs or
proposition, in distinction from the respondent, or defendant, who
maintains it.
Opponent-process theory of color vision According to the opponent-process theory of color vision is the theory that receptor cells for color are linked in pairs, working in opposition to