hi. the word is there.
one problem is that you used the word itself in the
definition.
diminution; noun - 1. the act ... of diminishing
“diminishing” should have been left out of the definition.
You fit in well here. That is a big pet peeve among most of us. My youngest asked what a plutocrat was last night and in looking it up, the defintion said a member of a plutocracy. Argh!
take it up with dictionary.com : ) today’s word is not diminish, it’s the noun— diminution. it’s my turn to be anal retentive and pedantic like the Soother.