Noun

(uncountable) State of being one or undivided; unity.

*{{quote-magazine, date=2013-06-07, author=David Simpson

, volume=188, issue=26, page=36, magazine=(The Guardian Weekly) , title= Fantasy of navigation , passage=It is tempting to speculate about the incentives or compulsions that might explain why anyone would take to the skies in [the] basket [of a balloon]: […]; perhaps to moralise on the oneness or fragility of the planet, or to see humanity for the small and circumscribed thing that it is; […].}}

(countable) The product of being one or undivided.

Noun

(harmonies)

Agreement or accord.

* America's social harmony has depended at least to some degree on economic growth. It is easier to get along when everyone, more or less, is getting ahead.'' — , '' Why It’s Time to Worry , Newsweek 2010-12-04

A pleasing combination of elements, or arrangement of sounds.

(music) The academic study of chords.

(music) Two or more notes played simultaneously to produce a chord.

(music) The relationship between two distinct musical pitches (musical pitches being frequencies of vibration which produce audible sound) played simultaneously.

A literary work which brings together or arranges systematically parallel passages of historians respecting the same events, and shows their agreement or consistency.

a harmony of the Gospels