spontaneous /spon-tāˈnyəs or -ni-əs/

1. Of one's free will
2. Acting by its own impulse or natural law
3. Produced of itself
4. Impulsive
5. Unpremeditated

spontaneity /-tə-nēˈi-ti or -nāˈi-ti/ noun

spontāˈneously adverb

spontāˈneousness noun

spontaneous abortion noun

Miscarriage

spontaneous behaviour noun (behaviourism)

Behaviour occurring in the apparent absence of any stimuli

spontaneous combustion noun

Catching fire by causes at work within, esp slow oxidation of a mass of matter

spontaneous generation noun

The supposed production of living organisms from non-living matter

spontaneous remission noun

Recovery without treatment

• volcanising
• volcanism
• volcanisms
• volcanist
• Volcanist
• volcanists
• volcanization
• volcanizations
• volcanize
• volcanized
• volcanizes
• volcanizing
• volcano
• volcanoes
• volt-amperes
• volte
• volted
• volte-face
• voltes
• voltigeur
• voltigeurs
• volting
• voltinism
• voltinisms
• voltmeter