To lessen; to make less or smaller, by any means; opposed to increase and augment; as, to diminish the size of a thing by contraction, or by cutting off a part; to diminish a number by subtraction; to diminish the revenue by limiting commerce, or reducing the customs; to diminish strength or safety; to diminish the heat of a room. It is particularly applied to bulk and quantity, as shorten is to length.

To lessen; to impair; to degrade. I will diminish them, that they shall no more rule over the nations. Ezekiel 29:15.

In music, to take from a note by a sharp, flat or natural. To diminish from, to take away something. Neither shall you diminish aught from it Deuteronomy 4:2.

To lessen; to become or appear less or smaller. The size of an object diminishes, as we recede from it.