a designation of the amount or quantity of a unit of measure
unitage in American English
(ˈjuːnɪtɪdʒ)
noun
specification of the amount making up a unit in a system of measurement
Word origin
[1635–45 in sense “act of uniting”; unit + -age]This word is first recorded in the period 1635–45. Other words that entered Englishat around the same time include: cascade, domesticate, focus, intaglio, linear-age is a suffix typically forming mass or abstract nouns from various parts of speech,occurring originally in loanwords from French (voyage; courage) and productive in English with the meanings “aggregate” (coinage; peerage; trackage), “process” (coverage; breakage), “the outcome of” as either “the fact of” or “the physical effect or remains of”(seepage; wreckage; spoilage), “place of living or business” (parsonage; brokerage), “social standing or relationship” (bondage; marriage; patronage), and “quantity, measure, or charge” (footage; shortage; tonnage; towage)