Discord (noun)

1. Lack of agreement or harmony between people or groups.
2. A harsh or dissonant mixture of sounds.

Origin:

Middle english: from old french desacord, from des- (expressing negation) + acord "agreement" (from latin concordia).

Examples:

1. The discord between the two countries was caused by political differences.
2. The discord between the siblings was resolved after a heart-to-heart talk.
3. The discord between the band members caused them to disband.
4. The discord between the employees and the management caused a strike.
5. The discord between the notes in the music created a sense of tension.