Sexual orientation to persons of the same sex.(noun)
Sexual activity with another of the same sex.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "homosexuality" in a sentence
"If, for example, homosexuality is objectively wrong, then it is simply irrelevant that a substantial portion of the human race finds homosexual activity pleasurable and satisfying, and that homosexuality* does no one else any material harm."
"That was in the mid-1990s, when the term homosexuality was far from ordinary in Chinese people's life."
"Just because the term homosexuality may be modern; the concept was not."