Definitions
1.adjectiveSelf-generated; happening without any apparent external cause."He made a spontaneous offer of help."
2.adjectiveDone by one's own free choice, or without planning.
3.adjectiveProceeding from natural feeling or native tendency without external or conscious constraint
4.adjectiveArising from a momentary impulse
5.adjectiveControlled and directed internally; self-active; spontaneous movement characteristic of living things
6.adjectiveProduced without being planted or without human cultivation or labor.
7.adjectiveRandom.
8.adjectiveSudden, without warning.