His term makes more sense. Through a series of meter changes the tempo of a piece is made to change (either faster or slower) in a controlled manner.
In this canon, I have written a tempo modulation that speeds up. First I establish the dotted quarter note beat in 6/8 and then speed up the pulse by moving to a quarter note beat in 2/4. Then I maintain that beat rate but change the beat back to a dotted quarter.
(click on image to enlarge)
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