-tuple

adj combining form, n combining form

indicating a set of the number specified

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

Word Origin and History for -tuple

1863, word-forming element abstracted from quintuple, etc.