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).
suffix forming nouns of act, process, function, condition, from O.Fr./Fr. -age, from L.L. -aticum "belonging to, related to," originally neut. adj. suffix, from L. -atus, pp. suffix of verbs of the first conjugation.