1. Sevenfold.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• aeptuple,
• zeptuple,
• xeptuple,
• deptuple,
• eeptuple,
• weptuple,
• swptuple,
• ssptuple,
• sdptuple,
• srptuple,
• s4ptuple,
• s3ptuple,
• seotuple,
• seltuple,
• se-tuple,
• septuplle,
• septupple,
• septupl,
• septupel,
• septupla

The adjective form of the word "septuple" is "septuplet".

The plural of the "septuple" can be the "septuples".

The singular of the "septuple" can be the "septuple".