1. Noun
The quality or state of being spontaneous, or acting from native feeling, proneness, or temperament, without constraint or external force.
2. Noun
The tendency to undergo change, characteristic of both animal and vegetable organisms, and not restrained or cheked by the environment.
3. Noun
The tendency to activity of muscular tissue, including the voluntary muscles, when in a state of healthful vigor and refreshment.
4. Noun
the quality of being spontaneous and coming from natural feelings without constraint; "the spontaneity of his laughter"
Vocabulary classified under Environmental science
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