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  1. of the nature of or involving supposition; suppositional.
  2. supposititious or false.
  3. Grammar. expressing or noting supposition, as the words if, granting, or provided.
  1. Grammar. a suppositive word.

Origin of suppositive

1595–1605; < Late Latin suppositīvus, equivalent to supposit(us) (see supposition) + -īvus -ive
Related formssup·pos·i·tive·ly, adverbnon·sup·pos·i·tive, adjective, nounnon·sup·pos·i·tive·ly, adverbun·sup·pos·i·tive, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for suppositive

Historical Examples

  • It tends to slanting and suppositive traducing of the records.

    Cambridge and its Story

    Charles William Stubbs

British Dictionary definitions for suppositive


  1. of, involving, or arising out of supposition
  2. grammar denoting a conjunction introducing a clause expressing a supposition, as for example if, supposing, or provided that
  1. grammar a suppositive conjunction
Derived Formssuppositively, adverb
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