from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Sexual orientation to persons of the opposite sex.
- n. Sexual activity with another of the opposite sex.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The state of being emotionally or sexually attracted to persons of the opposite sex.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a sexual attraction to (or sexual relations with) persons of the opposite sex
From hetero- + sexuality. (Wiktionary)