|rēnfōr|tsän(ˌ)dō adjective (or adverb)
Etymology: Italian, reinforcing, strengthening, verbal of rinforzare to reinforce, strengthen, from ri- re- (from Latin re- ) + inforzare to enforce, strengthen, from Old Italian, from Middle French enforcier — more at enforce
: played with a sudden increase of force — used as a direction in music usually for special emphasis of a note, chord, or short phrase; abbr. rf or rfz ; compare sforzando