I. mə̇ˈlesəməl noun
( -s )
Etymology: Latin millesim us, adjective, thousandth + English -al (as in decimal, n.)
: thousandth
II. adjective
Etymology: Latin millesim us, adjective, thousandth (from mille thousand) + English -al, adjective suffix — more at mile
: consisting of or concerned with thousandths
millesimal fractions
• mil·les·i·mal·ly -məlē adverb