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The expression fortepiano (sometimes called forte piano) is a sudden dynamic change used in a musical score, usually with the abbreviation fp, to designate a section of music in which the music should be played loudly (forte), then immediately softly (piano). The word is of Italian etymology literally translated as 'loudsoft'.
Examples
Beethoven's Piano Sonata No. 8 begins with a fortepiano:
References
Fortepiano (musical dynamic) Wikipedia(Text) CC BY-SA