Definition from Wiktionary, the free dictionary
- Self generated; happening without any apparent external cause.
- He made a spontaneous offer of help.
- Done by one's own free choice, or without planning.
- proceeding from natural feeling or native tendency without external constraint
- arising from a momentary impulse
- controlled and directed internally : self-active : spontaneous movement characteristic of living things
- produced without being planted or without human labor : indigenous
- not apparently contrived or manipulated : natural
- Sudden, without warning.
- (Self-generated): autonomous
- (Done by one's own free choice): autonomous
- (Proceeding from natural feeling...): autonomous
Derived terms 
Related terms 
Self generated; happening without any apparent external cause
Done by one's own free choice, or without planning
proceeding from natural feeling or native tendency without external constraint
arising from a momentary impulse
Sudden, without warning
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