simultaneity

Pronunciation: /ˌsɪməltəˈniːɪti/

The English word “simultaneity” has 2 meanings listed here.

noun

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.

From simultane(ous) + -ity. By surface analysis, simult(aneous) + -aneity. Compare French simultanéité.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.