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   spon·ta·ne·ous

   /spänˈtānēəs/

   adjective

   • 1. performed or occurring as a result of a sudden inner impulse or inclination and without premeditation or external stimulus: "the audience broke into spontaneous applause" Similar unforcedvoluntaryunconstrainedunpromptedunbiddenunsolicitedunplannedunpremeditatedunrehearsedimpulsiveimpetuousunstudiedimpromptuspur-of-the-momentextemporeextemporaneousunschooleduntaughtuninstructedinformal:off-the-cuffOpposite plannedforcedcalculated
   • ▪ (of a person) having an open, natural, and uninhibited manner. Similar naturaluninhibitedrelaxedunselfconsciousunaffectedeasyfree and easyimpulsiveimpetuousopengenuineOpposite inhibited
   • ▪ (of a process or event) occurring without apparent external cause: "spontaneous miscarriages"
   • ▪ (of movement or activity in an organism) instinctive or involuntary: "the spontaneous mechanical activity of circular smooth muscle" Similar reflexautomaticknee-jerkinvoluntaryunthinkingunconsciousinstinctiveinstinctualinformal:gutOpposite conscious
   • ▪ (of a plant) growing naturally and without being tended or cultivated.

   Word Origin mid 17th century: from late Latin spontaneus (from (sua) sponte ‘of (one's) own accord’) + -ous.

   Derivatives

   • 1. spontaneousness noun

   Scrabble Points: 13

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   More definitions, origin and scrabble points

2. www.merriam-webster.com › dictionary › spontaneousSpontaneous Definition & Meaning - Merriam-Webster

   www.merriam-webster.com › dictionary › spontaneous

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   Learn the origin, synonyms, and usage of the word spontaneous, which means acting or happening without external constraint or influence. See examples of spontaneous in sentences and phrases, and compare it with related words like impulsive and instinctive.

3. dictionary.cambridge.org › dictionary › englishSPONTANEOUS | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › dictionary › english

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   Spontaneous means happening or done in a natural, often sudden way, without any planning or without being forced. It also means happening without being caused by something outside, or without the organism's control. See more meanings, examples and translations of spontaneous.

4. Videos

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5. www.dictionary.com › browse › spontaneousSPONTANEOUS Definition & Meaning | Dictionary.com

   www.dictionary.com › browse › spontaneous

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   Spontaneous means natural and unplanned. When you describe an action or event as spontaneous, it means it happened naturally, without having been planned, as in The meeting turned into a spontaneous dance party.

6. www.vocabulary.com › dictionary › spontaneousSpontaneous - Definition, Meaning & Synonyms | Vocabulary.com

   www.vocabulary.com › dictionary › spontaneous

   Something spontaneous happens when you're least expecting it. Spontaneous things are natural or instinctive, and they happen without warning. If you plan to go to a movie and then you go, that's not a spontaneous thing.

7. dictionary.cambridge.org › us › dictionarySPONTANEOUS | definition in the Cambridge English Dictionary

   dictionary.cambridge.org › us › dictionary

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   Spontaneous means happening or done in a natural, often sudden way, without any planning or without being forced. Learn more about the meaning, usage and pronunciation of spontaneous with examples and translations.

8. www.collinsdictionary.com › dictionary › englishSPONTANEOUS definition and meaning | Collins English Dictionary

   www.collinsdictionary.com › dictionary › english

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   Spontaneous means not planned or arranged, but done because someone suddenly wants to do them. It also means happening because of natural processes or forces, or growing naturally without cultivation.

9. www.thefreedictionary.com › spontaneousSpontaneous - definition of spontaneous by The Free Dictionary

   www.thefreedictionary.com › spontaneous

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   Spontaneous means happening or arising without apparent external cause, or acting or happening from a natural impulse or tendency. Find different dictionaries, thesaurus, and translations of spontaneous on this web page.