Synonyms for Diminution:

n.

plunge, slump, collapse. depression (noun)
depression, sinking, debasement, attenuation, decrease, lowering.
diminution (noun)
decrease, decline, reduction, step down.
lessening, reduction (noun)
curtailment, cutback, decrease, abatement, decline, cut, alleviation.

v.

lessening (verb)
alleviation.

Other synonyms:

cutback, Diminishment. curtailment, abatement, slowdown, taper. drain. reduction
reduction.
step-down
step down.
Other relevant words:
cut, Diminishment, alleviation, slump, cutback, abatement, reduction, decline, slash, drain, taper, collapse, slowdown, curtailment.

Usage examples for diminution

  1. He is welcome to that diminution and to all the consequences he can draw from it. – The Works of the Right Honourable Edmund Burke, Vol. I. (of 12) by Edmund Burke
  2. A reform must be introduced, and those who before had rejoiced in a superfluity of royal gifts had to be contented with a diminution of them. – Marie Antoinette And Her Son by Louise Muhlbach Official
  3. It cannot however be denied that they themselves in recent times have often followed the bad example, and many consider that this is one of the main reasons of the great diminution in the numbers of the walrus of late years. – The Voyage of the Vega round Asia and Europe, Volume I and Volume II by A.E. Nordenskieold