septuplet

[ sep-tuhp-lit, -too-plit, -tyoo- ]
/ sɛpˈtʌp lɪt, -ˈtu plɪt, -ˈtyu- /

noun

any group or combination of seven.
one of seven offspring born at one birth.
septuplets, seven offspring born at one birth.
Music. a group of seven notes of equal value performed in the same amount of time normally taken to perform four or six.

Origin of septuplet

First recorded in 1890–95; septuple + -et
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for septuplet

septuplet
/ (sɛpˈtjuːplɪt, ˈsɛptjʊplɪt) /

noun

music a group of seven notes played in a time value of six, eight, etc
one of seven offspring produced at one birth
a group of seven things
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012