spontaneous Example Sentence:

Spontaneous smiles were relatively easy to capture by the 1890s, so we must look elsewhere for an explanation of why Victorians still hesitated to smile.

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Related: spontaneous

Prev: As Masurium, it was the first element discovered that occurs in nature only from spontaneous fission, and as Technetium, it was the first element discovered in a laboratory.

Next: Others are spontaneous private behavior, as people avoid large gatherings.