In chemistry, one-tenth of a mole; a unit of amount of substance equal to 0.1 moles.
From 'deci-' (one-tenth) plus 'mole' (unit of substance). Part of the systematic metric prefix system for expressing decimal fractions of scientific units.
While 'decimole' is technically a valid chemistry term, it's almost never used—chemists just say '0.1 mole' instead, showing how technical terminology doesn't always match what people actually say in practice.
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