Italian

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Etymology

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From familiare +‎ -issimo.

Adjective

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familiarissimo (feminine familiarissima, masculine plural familiarissimi, feminine plural familiarissime)

  1. superlative degree of familiare (very familiar)

Latin

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Adjective

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familiārissimō

  1. dative/ablative masculine/neuter singular of familiārissimus