relation an abstraction belonging to or characteristic of two entities or parts together
antipode direct opposite; "quiet: an antipode to focused busyness"
antithesis the juxtaposition of contrasting words or ideas to give a feeling of balance
conflict an open clash between two opposing groups (or individuals); "the harder the conflict the more glorious the triumph"--Thomas Paine; "police tried to control the battle between the pro- and anti-abortion mobs"
flip side a different aspect of something (especially the opposite aspect); "the flip side of your positive qualities sometimes get out of control"; "on the flip side of partnerships he talked about their competition"
mutual opposition,
polarity a relation between two opposite attributes or tendencies; "he viewed it as a balanced polarity between good and evil"
polarity,
sign having an indicated pole (as the distinction between positive and negative electric charges); "he got the polarity of the battery reversed"; "charges of opposite sign"
ungradable opposition an opposition that has no intermediate grade; either one or the other
contradictoriness the relation that exists when opposites cannot coexist
contradiction the speech act of contradicting someone; "he spoke as if he thought his claims were immune to contradiction"
contrary a logical relation such that two propositions are contraries if both cannot be true but both can be false
