1. A prefix that is often misunderstood because it has two etymological meanings: -- a) From the Greekhomos meaning same / the same, as in homosexuality (same-sex love), homogenous (uniform). (The opposite is hetero- from the Greek heteros meaning different from); -- b) From the Latin homo, meaning human / human being (a member of the genus Homo), as in Homo sapiens, hominophobia, homicide.
2. A combining form for words pertaining to homosexuals (same-sex lovers). In Greek, homo means the same as and is the basis for homo sexual, a lover of the same sex.
3. Homo , a widespread abbreviation of homosexual; pejorative when used by heterosexuals to refer to a male or female homosexual; homos , refers derogatorily to homosexuals in general. A gayman was once referred to as a four-letter man (H-O-M-O). Quote: Gay slogan: ' Homosexuality is not a four-letter word.'