1) Like septuplets 2) Multiple 3) Septuple 4) Seven times 1) Multiple 2) Septuple 
• (a.) Repeated seven times; having seven thicknesses; increased to seven times the size or amount. • (adv.) Seven times as much or as often.
Sev'en·fold` adjective Repeated seven times; having seven thicknesses; increased to seven times the size or amount. ' Sevenfold rage.' Milton. 
[adv] - seven times
adverb seven times; `the population of this village increased sevenfold in the past 100 years`