fortississimo

adverb (or adjective)
for·​tis·​sis·​si·​mo | \¦fȯ(r)tə¦sisəˌmō\

Definition of fortississimo 

: with greatest loudness used as a direction in music abbreviation fff

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History and Etymology for fortississimo

Italian, from fortissimo (by reduplication of the -iss- of the superlative suffix)

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