An incompatibility, as of two things that cannot be simultaneously fulfilled.
A clash or disagreement, often violent, between two or more opposing groups or individuals.
To overlap (with), as in a schedule.
To be at odds (with); to disagree or be incompatible
The quality or state of being simultaneous; simultaneousness.
More than one complete musical texture occurring at the same time. This first appeared in the music of Charles Ives, and is common in the music of Conlon Nancarrow, and others.