One who opposes something.

plural of againster

In a contrary direction to. / In physical opposition to; in collision with. / In physical contact with, so as to abut or be supported by. / Close to, alongside. / In front of; before (a background).

(obsolete) By the time that (something happened); before.

The state or quality of being against.

plural of againstism

The perspective or activity of being against something, or of having a contrary demeanor in general; a pattern of repeated opposition or criticism.

In comparison to

(transitive, idiomatic) To rebel or oppose to something formerly supported. / (transitive, intransitive) To set against or in opposition to something.

(woodworking, of sanding or planing a piece of wood) Preventing a smooth, level surface from being formed by raising the nap of the wood or causing larger splinters to form ahead of the cutting tool below the cutting surface.