Definition from Wiktionary, the free dictionary
From Ancient Greek αὐτονομία (autonomia), from αὐτόνομος (autonomos), from αὐτός (autos, “self”) + νόμος (nomos, “law”). See auto- (“self”) and -nomy (“a system of rules or laws about a particular field”).
Audio (US) (file)
- Self-government; freedom to act or function independently.
- (philosophy) The capacity to make an informed, uncoerced decision.
- (mechanics) The capacity of a system to make a decision about its actions without the involvement of another system or operator.
- (Christianity) The status of a church whose highest-ranking bishop is appointed by the patriarch of the mother church, but which is self-governing in all other respects. Compare autocephaly.
- (self-government): dependency, nonautonomy, inoperability
- (capacity to make independent decisions): heteronomy, incapacity
Derived terms 
capacity for individual decision