v. sup·posed, sup·pos·ing, sup·pos·es
1. To assume to be true or real for the sake of argument or explanation: Suppose we win the lottery.
a. To believe, especially on uncertain or tentative grounds: Scientists supposed that large dinosaurs lived in swamps.
b. To consider to be probable or likely: I suppose it will rain.
3. To imply as an antecedent condition; presuppose: "Patience must suppose pain" (Samuel Johnson).
4. To consider as a suggestion: Suppose we dine together.
To imagine; conjecture.
[Middle English supposen, from Old French supposer, alteration (influenced by poser, to place) of Medieval Latin suppōnere, from Latin, to put under : sub-, sub- + pōnere, to place; see apo- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.
American Heritage Dictionary Products
The American Heritage Dictionary, 5th Edition
The American Heritage Dictionary of Idioms
The American Heritage Roget's Thesaurus
Curious George's Dictionary
The American Heritage Children's Dictionary
The American Heritage Dictionary of Indo-European Roots
The American Heritage Student Grammar Dictionary
The American Heritage Desk Dictionary + Thesaurus
The American Heritage Science Dictionary
The American Heritage Dictionary of Business Terms
The American Heritage Student Dictionary
The American Heritage Essential Student Thesaurus