The state of two or more things existing together, usually in a temporal or spatial sense, with or without mutual interaction.
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 pleasing combination of elements, or arrangement of sounds.
The academic study of chords.
Agreement or accord.
Two or more notes played simultaneously to produce a chord.