- The definition of spontaneous is unplanned or done on impulse.
An example of spontaneous is waking up and deciding to take a trip across the country that day.
- acting in accordance with or resulting from a natural feeling, impulse, or tendency, without any constraint, effort, or premeditation
- having no apparent external cause or influence; occurring or produced by its own energy, force, etc. or through internal causes; self-acting
- growing naturally without being planted or tended; indigenous; wild
Origin of spontaneousLate Latin spontaneus ; from Classical Latin sponte, of free will ; from Indo-European base an unverified form (s)pen(d)-, to pull from source spin
- Happening or arising without apparent external cause; self-generated: a microorganism capable of spontaneous movement.
- Arising from a natural inclination or impulse and not from forethought or prompting: spontaneous laughter; a spontaneous protest.
- Unconstrained and unstudied in manner or behavior: a spontaneous personality.
- Growing without cultivation or human labor: spontaneous vegetation.
Origin of spontaneousFrom Late Latin spontāneus, of one's own accord, from Latin sponte; see (s)pen- in Indo-European roots.
(comparative more spontaneous, superlative most spontaneous)
- 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.