1. (n.) The act of opposing; an attempt to check, restrain, or defeat; resistance.

2. (n.) The state of being placed over against; situation so as to front something else.

3. (n.) Repugnance; contrariety of sentiment, interest, or purpose; antipathy.

4. (n.) That which opposes; an obstacle; specifically, the aggregate of persons or things opposing; hence, in politics and parliamentary practice, the party opposed to the party in power.

5. (n.) The situation of a heavenly body with respect to another when in the part of the heavens directly opposite to it; especially, the position of a planet or satellite when its longitude differs from that of the sun 180; -- signified by the symbol /; as, / / /, opposition of Jupiter to the sun.

6. (n.) The relation between two propositions when, having the same subject and predicate, they differ in quantity, or in quality, or in both; or between two propositions which have the same matter but a different form.

adversary adversity agreement to disagree alienation allegory analogy antagonism antagonist antagonistic anteposition antipathy antithesis antithetical apostasy argumentation arrest arrestation arrestment assailant at daggers drawn averseness aversion backlash backwardness balancing ban blackball blackballing blockage blocking challenge check clashing clogging closing up closure collision combatant combative reaction comparative anatomy comparative degree comparative grammar comparative judgment comparative linguistics comparative literature comparative method compare comparing comparison competing competition competitive competitor complaint con conflict conflicting confrontation confrontment confutation constriction contention contradiction contradistinction contraindication contraposition contrariety contrast contrastiveness controversy correlation counter-culture counteraction counterposition counterworking cramp crankiness cross-purposes crotchetiness cursoriness defiance delay demur departure detainment detention deviation difference dim view disaccord disaccordance disagreement disappointment disapprobation disapproval disconformity discongruity discontent discontentedness discontentment discord discordance discordancy discrepancy discreteness disenchantment disesteem disfavor disgruntlement disharmony disillusion disillusionment disinclination disobedience disparity displeasure dispute disrelish disrespect dissatisfaction dissension dissent dissentience dissidence dissimilarity dissonance distaste distinction distinctiveness distinctness disunion disunity divergence divergency diversity dropping out enemy exclusion faction far cry fixation flak foe foeman foot-dragging fractiousness friction grudging consent grudgingness hampering heterogeneity hindering hindrance holdback holdup hostile hostility impediment in opposition inaccordance incompatibility incongruity inconsistency inconsonance indignation indisposedness indisposition indocility inequality inharmoniousness inharmony inhibition inimicalness interference interruption intractableness irreconcilability jarring kick lack of enthusiasm lack of zeal let likening low estimation low opinion matching metaphor minority opinion mixture mutinousness negation negativism nolition nonagreement nonassent nonconcurrence nonconformity nonconsent noncooperation nuisance value objection obstinacy obstruction obstructionism occlusion odds opponent opposed opposing opposing party opposite camp oppositeness opposure oppugnance oppugnancy ostracism other side otherness parallelism passive resistance perfunctoriness perverseness perversity polar opposition polarity polarization posing against proportion protest reaction rebuff recalcitrance recalcitrancy recalcitration recoil recusance recusancy refractoriness refusal rejection relation reluctance renitence renitency repellence repellency repercussion repression repudiation repugnance repulse repulsion resistance restraint