fortissimo >> fɔːˈtɪsɪməʊ
Definition: [adverb] (especially as a direction) very loudly.
Example: he plays fortissimo at one point in the finale of the Rachmaninoff
Definition: [adjective] played very loudly.
Example: the movement ends with a fortissimo coda
Definition: [noun] a passage marked to be performed very loudly.
Example: Tchaikovsky's fortissimos are given plenty of weight in the bass