Italian

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Etymology

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From veloce +‎ -issimo.

Adjective

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velocissimo (feminine velocissima, masculine plural velocissimi, feminine plural velocissime)

  1. superlative degree of veloce (very fast, very quick, very speedy)

Latin

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Adjective

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vēlocissimō

  1. dative/ablative masculine/neuter singular of vēlocissimus