[ suh-pohz ]
See synonyms for: supposesupposedsupposessupposing on

verb (used with object),sup·posed, sup·pos·ing.
  1. to assume (something), as for the sake of argument or as part of a proposition or theory: Suppose the distance to be one mile.

  2. to consider (something) as a possibility suggested or an idea or plan proposed: Suppose we wait until tomorrow.

  1. to believe or assume as true; take for granted: It is supposed that his death was an accident.

  2. to think or hold as an opinion: What do you suppose he will do?

  3. to require logically; imply; presuppose: The evidence supposes his presence near the scene.

  4. (used in the passive) to expect or design; require or permit (followed by an infinitive verb):The machine is supposed to make noise. I'm not supposed to run fast.

verb (used without object),sup·posed, sup·pos·ing.
  1. to assume something; presume; think.

Origin of suppose

First recorded in 1275–1325; Middle English supposen, from Old French supposer, equivalent to sup- sup- + poser “to place, put” (see pose1); compare Medieval Latin suppōnere “to suppose,” Latin: “to substitute, place below”

Other words from suppose

  • sup·pos·a·ble, adjective
  • sup·pos·a·bly, adverb
  • sup·pos·er, noun
  • mis·sup·pose, verb, mis·sup·posed, mis·sup·pos·ing.
  • un·sup·pos·a·ble, adjective

Words Nearby suppose Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use suppose in a sentence

British Dictionary definitions for suppose


/ (səˈpəʊz) /

verb(tr; may take a clause as object)
  1. to presume (something) to be true without certain knowledge: I suppose he meant to kill her

  2. to consider as a possible suggestion for the sake of discussion, elucidation, etc; postulate: suppose that he wins the election

  1. (of theories, propositions, etc) to imply the inference or assumption (of): your policy supposes full employment

Origin of suppose

C14: from Old French supposer, from Medieval Latin suppōnere, from Latin: to substitute, from sub- + pōnere to put

Derived forms of suppose

  • supposable, adjective
  • supposer, noun

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

Other Idioms and Phrases with suppose


see I suppose so.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.