Seven times as much in size, strength, number, or amount.
n. A sevenfold amount or number. tr. & intr.v.
sep·tu·pled, sep·tu·pling, sep·tu·ples To multiply or be multiplied by seven.
[Late Latin septuplus, sevenfold : Latin septem, seven; see sept in Indo-European roots + -plus, -fold; see pel-2 in Indo-European roots.] sep·tu'ply adv.