The quality or state of being sexually attracted to people of more than one gender.
From 'bisexual' plus the suffix '-ity,' forming a noun. Developed in late 19th and 20th century terminology as psychology and sexology expanded.
While 'bisexualism' and 'bisexuality' mean similar things, 'bisexuality' is now the standard term used in modern psychology, sociology, and everyday language—showing how language naturally settles on preferred forms over time.
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