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sex-

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  1. a combining form, occurring in loanwords from Latin, meaning “six” (sexagenary); on this model used in the formation of compound words: sexpartite.
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Also sexi-.

Origin of sex-

< Latin, combining form of sex six
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for sex-

sex-

combining form
  1. sixsexcentennial
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Word Origin

from Latin
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