Homosexuality (noun)

1. The condition of being sexually attracted to people of the same sex.
2. The state of being gay or lesbian.

Origin:

19th century: from homosexual + -ity.

Examples:

1. Homosexuality is no longer considered a mental disorder in most countries.
2. The community has become more accepting of homosexuality in recent years.
3. He struggled with his homosexuality for many years before coming out.
4. The society still discriminates against homosexuality.
5. The study found no genetic link to homosexuality.