Etymology
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ninefold (adj., adv.)

"nine times repeated, nine times as great or numerous; consisting of nine parts," 1550s; see nine + -fold. Possibly a 16c. formation; the word is not attested in Middle English, but late Old English had nigonfeald.

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Definitions of ninefold
1
ninefold (adv.)
by a factor of nine;
my investment has increased ninefold
Synonyms: nine times
2
ninefold (adj.)
having nine units or components;
Synonyms: nonuple / nine-fold
From wordnet.princeton.edu