endogeny
Technical term used in biology, geology, and related fields to describe processes originating from within an organism, cell, or system. Not common in everyday conversation.
Endogenous rhythms are maintained even without external stimuli.
The growth of this plant is regulated by endogenous hormones.
Compound of 内 (nai, 'inside') and 生 (sei, 'life, birth, growth'), literally 'inner growth'. The exact historical derivation is uncertain, but the term is used in modern technical vocabulary as a translation of Western scientific concepts.