I. ˈāt|fōld adjective
Etymology: Middle English eightefold, from Old English eahtafeald, from eahta eight + -feald -fold
1. : having eight parts or aspects
2. : being eight times as large, as great, or as many as some understood size, degree, or amount
an eightfold increase
II. adverb
: to eight times as much or as many : by eight times
increased eightfold