from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The branch of ecology that deals with the biological relationship between an individual organism or an individual species and its environment.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. one of two broad subdivisions of ecology, which studies the individual organism or species.
From Ancient Greek via Latin auto- (“on itself”) + ecology. (Wiktionary)