Merriam-Webster Collegiate Dictionary - discord

 I. noun  Etymology: Middle English descorde, ~, from Anglo-French descorde, from Latin ~ia, from ~-, discors  Date: 13th century  1.  a. lack of agreement or harmony (as between persons, things, or ideas)  b. active quarreling or conflict resulting from ~ among persons or factions ; strife  2.  a.  (1) a combination of musical sounds that strikes the ear harshly  (2) dissonance  b. a harsh or unpleasant sound Synonyms:  ~, strife, conflict, contention, dissension, variance mean a state or condition marked by a lack of agreement or harmony. ~ implies an intrinsic or essential lack of harmony producing quarreling, factiousness, or antagonism a political party long racked by ~. strife emphasizes a struggle for superiority rather than the incongruity or incompatibility of the persons or things involved during his brief reign the empire was never free of civil strife. conflict usually stresses the action of forces in opposition but in static applications implies an irreconcilability as of duties or desires the conflict of freedom and responsibility. contention applies to strife or competition that shows itself in quarreling, disputing, or controversy several points of contention about the new zoning law. dissension implies strife or ~ and stresses a division into factions religious dissension threatened to split the colony. variance implies a clash between persons or things owing to a difference in nature, opinion, or interest cultural variances that work against a national identity.  II. intransitive verb  Etymology: Middle English, from Anglo-French descorder, from Latin ~are, from ~-, discors ~ant, from dis- + cord-, cor heart — more at heart  Date: 14th century disagree, clash