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Definitions from the Web

Spontaneous

Adjective

1. Happening or done in a natural, sudden, and impulsive way, without any previous planning or preparation.

Example sentence: The couple took a spontaneous road trip and ended up at a hidden beach.

2. (Of a person) Acting or speaking without thinking or considering the consequences beforehand.

Example sentence: Sarah's spontaneous decision to quit her job shocked everyone in the office.

Adverb

1. In a spontaneous manner; without prior planning or preparation.

Example sentence: They decided to go on a trip spontaneously.

Noun

1. (Biology) A process or event occurring naturally, without external influence.

Example sentence: The development of a new species was believed to be a spontaneous occurrence.

2. An impromptu musical or theatrical performance.

Example sentence: The street musicians put on a spontaneous jazz performance that attracted quite a crowd.