The amount by which something decreases; a reduction or diminution in quantity, size, or degree.
From 'decrease' + -ment (a suffix forming nouns). 'Decrease' comes from de- + crescere (to grow), and -ment creates abstract nouns. Similar to 'increment' but with the opposite meaning (de- instead of in-).
Scientists and mathematicians prefer 'decrement' (without the -ent), but 'decreement' appears in older texts as a slightly archaic variant—showing how technical vocabulary has standardized over time to make formulas and communication clearer.
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