2.The shortening of the time values of notes in a melodic part.
‘He nurses it through E flat, B flat minor and various wispy _diminutions_ , never losing sight of his beginning; then finally cranks it up through G flat / F sharp minor back to the initial high D for his recapitulation, ‘Who will remember?’’
‘The motif moves in dotted minims, and though _diminutions_ of it and its inversion abound throughout the symphony, it is in this rhythmic form that it plays its most important role.’