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dilute to make (a solution) thinner or less concentrated by adding more solvent. [4 definitions]
dilution the act of diluting or state of being diluted. [2 definitions]
diluvial of or caused by a glacier or flood.
dim poorly lighted. [9 definitions]
dime a coin of the United States and Canada equaling ten cents.
dimenhydrinate a crystalline antihistamine used to control motion sickness and allergies.
dime novel a cheap paperback novel with much adventure or romance.
dimension size as measured in a particular direction such as height, width, or depth. [5 definitions]
dimensionless combined form of dimension.
dime store a store that sells mostly inexpensive products; five-and-ten.
diminish to decrease or abate; dwindle. [3 definitions]
diminishable combined form of diminish.
diminished of a musical interval or chord, lower by a semitone or half step.
diminishing becoming smaller; lessening or decreasing.
diminishing returns a proposition in economics that when the amount of one factor of production, such as labor, is increased past a certain point while the amounts of other factors, such as land or capital, are held constant, additional output will increase only at a progressively lower and lower rate.
diminuendo gradually decreasing in loudness or force; decrescendo (used as a musical direction). [3 definitions]
diminution the act, process, or result of diminishing; decrease.
diminutive very small; tiny. [4 definitions]
dimity a sheer fabric, usu. of cotton, woven with a fine stripe or check of heavier thread.
dimmer a device for varying the brightness of an electric light; rheostat. [2 definitions]
dimorphism the existence of two forms of a species that differ in morphology as, for example, in sexual dimorphism of birds. [3 definitions]