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adopted in order to deceive; fictitious; pretended; feigned:
an assumed name; an assumed air of humility.
taken for granted; supposed:
His assumed innocence proved untrue.
.
to take for granted or without proof:
to assume that everyone wants peace.
Synonyms: suppose, presuppose; postulate, posit.
to take upon oneself; undertake:
to assume an obligation.
to take over the duties or responsibilities of:
to assume the office of treasurer.
to take on (a particular character, quality, mode of life, etc.); adopt:
He assumed the style of an aggressive go-getter.
to take on; be invested or endowed with:
The situation assumed a threatening character.
to pretend to have or be; feign:
to assume a humble manner.
to appropriate or arrogate; seize; usurp:
to assume a right to oneself; to assume control.
to take upon oneself (the debts or obligations of another).
Archaic. to take into relation or association; adopt.
to take something for granted; presume.
Contemporary Examples

When he assumed the CEO post after that incident, Hurd pledged to make H-P a more transparent and ethical organization.
H-P’s PR Peter Lauria August 10, 2010

I assumed, as did the other secretaries, that the president wanted us to share in the celebration.
My Sober Celebration With Nixon Peter G. Peterson June 11, 2009

He and I assumed there would be several more years of serving together as junior hosts.
Michael Daly: My Last Day With JFK Michael Daly November 10, 2013

McCaughey said she had not read TNR’s apology, but that she assumed it was “politically motivated.”
The Woman Who Killed Health Care Benjamin Sarlin May 14, 2009

The ghost writer in question is assumed to be one Siobhan Curham—an established author of both YA and adult fiction.
Meet Zoella—The Newbie Author Whose Book Sales Topped J.K. Rowling Lucy Scholes December 10, 2014

Historical Examples

Faulkner assumed an air of real affliction, presumably for the departed.
Tom, Dick and Harry Talbot Baines Reed

He gives what His hearers might be assumed to be able to assimilate; but that is all.
The Conquest of Fear Basil King

I assumed, then, she must be talking to Miss Stuart, for surely she would not say that to her maid.
The Curved Blades Carolyn Wells

It is assumed that the children that are to eat this meal are not infants.
Woman’s Institute Library of Cookery, Vol. 5 Woman’s Institute of Domestic Arts and Sciences

It was thought the scoundrel had sailed for England under an assumed name.
The Hills of Refuge Will N. Harben

adjective
false; fictitious: an assumed name
taken for granted: an assumed result
usurped; arrogated: an assumed authority
verb (transitive)
(may take a clause as object) to take for granted; accept without proof; suppose: to assume that someone is sane
to take upon oneself; undertake or take on or over (a position, responsibility, etc): to assume office
to pretend to; feign: he assumed indifference, although the news affected him deeply
to take or put on; adopt: the problem assumed gigantic proportions
to appropriate or usurp (power, control, etc); arrogate: the revolutionaries assumed control of the city
(Christianity) (of God) to take up (the soul of a believer) into heaven
v.

early 15c., assumpten “to receive up into heaven” (especially of the Virgin Mary), also assumen “to arrogate,” from Latin assumere “to take up, take to oneself,” from ad- “to, up” (see ad-) + sumere “to take,” from sub “under” + emere “to take” (see exempt (adj.)).

Meaning “to suppose, to take for granted as the basis of argument” is first recorded 1590s; that of “to take or put on (an appearance, etc.)” is from c.1600. Related: Assumed; assuming. Early past participle was assumpt. In rhetorical usage, assume expresses what the assumer postulates, often as a confessed hypothesis; presume expresses what the presumer really believes.