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spontaneous

spon·ta·ne·ous

spontaneous

 
 
pronunciation:
span teI ni s
part of speech: adjective
definition 1: happening in a free way; not forced.
My friend suddenly let out a spontaneous laugh.
synonyms:
impulsive, natural, voluntary
similar words:
ad-lib, free, impetuous, snap
definition 2: happening without outside causes or forces.
There was a spontaneous explosion in the lab.
similar words:
automatic, natural
derivations: spontaneously (adv.), spontaneousness (n.)