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Sexual or romantic attraction to, or engagement in sexual activity with, people of one's own sex; homosexuality.
On the possible connotations and relationship with related terms, compare the note at "homoerotic".
Early 20th century; earliest use found in Ernest Jones (1879–1958). From homo- + erotism, apparently originally coined to render German Homoerotik; compare German †Homoerotismus, and see note at homoerotic.