hun·dred·fold I. \| ̷ ̷ ̷ ̷|fōld\adverb Etymology: Middle English, from hundred (II) + -fold : by 100 times < increased a hundredfold > < increased one hundredfold > — usually preceded by a, an, or a numeral (as one, four) II. adjective Etymology: Middle English, from hundred (II) + -fold : being 100 times as large, as great, or as many as some understood size, degree, or amount : very great — usually preceded by a, an, or a numeral (as one, four)