US /spɑnˈteɪ.ni.əs.li/ UK /spɒnˈteɪ.ni.əs.li/
adv Freq #19643

Meanings

  1. 1
    adv

    Suddenly and without planning, because you suddenly want to.

    They spontaneously decided to throw a party.

  2. 2
    adv

    Naturally, without an obvious outside cause.

    The crowd spontaneously began to sing.

Thesaurus

Synonyms
1 adv · suddenly and without... ad lib

Etymology

From spontaneous + -ly.

Topics

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