noun

diminution

dim-ih-NOO-shun/ˌdɪmɪˈnuːʃn/

A decrease in size, amount, or importance.

The three jars show a progressive diminution in the amount of water.

Three water jars at successively lower fill levels, clear reduction in amount.

Etymology

diLatincompletely

+minutLatinmake small

+ionLatinaction or process

The root's “making small” becomes the name of an action or process through the noun ending. Diminution therefore covers becoming less in amount, strength, or importance as well as physical size.

In context

IIEA11:22

that was a diminution of irish sovereignty because it could no longer by its vote to prevent a measure being passed in council

Paul Gallagher SC on "A Referendum for the ESM?"

More examples

The committee resists any diminution of its authority.
Researchers measure the diminution in the tumor's size.
The report notes a steady diminution in water supplies.

Forms

diminution · diminutions

diminish verb — To become less or make something less.

Similar words

reduction: Reduction often suggests a deliberate cut rather than gradual lessening.
decrease: Decrease is a more everyday term for something becoming less.
decline: Decline often describes a continuing loss of strength or quality.