v. as·sumed, as·sum·ing, as·sumes
1. To take for granted; suppose: The study assumes that prices will rise.
a. To take upon oneself (a duty or obligation): assume responsibility; assume another's debts.
b. To undertake the duties of (an office): assumed the presidency.
a. To take on (an appearance, role, or form, for example); adopt: "The god assumes a human form" (John Ruskin).
b. To pretend to have; feign: assume an air of authority.
4. To take over without justification; seize: assume control.
5. To clothe oneself in; don: The queen assumed a velvet robe.
6. To take up or receive into heaven.
To make a supposition; suppose or believe: "Is Kay's husband coming to dinner too?" "I assume so."
[Middle English assumen, from Latin assūmere : ad-, ad- + sūmere, to take; see em- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2017 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