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assuming

[uh-soo-ming] /əˈsu mɪŋ/
adjective
1.
taking too much for granted; presumptuous.
Origin
1595-1605
1595-1605; assume + -ing2
Related forms
assumingly, adverb
self-assuming, adjective

assume

[uh-soom] /əˈsum/
verb (used with object), assumed, assuming.
1.
to take for granted or without proof:
to assume that everyone wants peace.
2.
to take upon oneself; undertake:
to assume an obligation.
3.
to take over the duties or responsibilities of:
to assume the office of treasurer.
4.
to take on (a particular character, quality, mode of life, etc.); adopt:
He assumed the style of an aggressive go-getter.
5.
to take on; be invested or endowed with:
The situation assumed a threatening character.
6.
to pretend to have or be; feign:
to assume a humble manner.
7.
to appropriate or arrogate; seize; usurp:
to assume a right to oneself; to assume control.
8.
to take upon oneself (the debts or obligations of another).
9.
Archaic. to take into relation or association; adopt.
verb (used without object), assumed, assuming.
10.
to take something for granted; presume.
Origin
1400-50; late Middle English (< Anglo-French assumer) < Latin assūmere to take to, adopt, equivalent to as- as- + sūmere to take up; see consume
Related forms
assumer, noun
overassume, verb (used with object), overassumed, overassuming.
preassume, verb (used with object), preassumed, preassuming.
reassume, verb (used with object), reassumed, reassuming.
Synonym Study
6. assume, Pretend, affect, feign imply an attempt to create a false appearance. To assume is to take on or put on a specific outward appearance, often (but not always) with intent to deceive: to assume an air of indifference. To pretend is to create an imaginary characteristic or to play a part: to pretend sorrow. To affect is to make a consciously artificial show of having qualities that one thinks would look well and impress others: to affect shyness. To feign implies using ingenuity in pretense, and some degree of imitation of appearance or characteristics: to feign surprise.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for assuming

assuming

/əˈsjuːmɪŋ/
adjective
1.
expecting too much; presumptuous; arrogant
conjunction
2.
(often foll by that) if it is assumed or taken for granted (that) even assuming he understands the problem, he will never take any action

assume

/əˈsjuːm/
verb (transitive)
1.
(may take a clause as object) to take for granted; accept without proof; suppose to assume that someone is sane
2.
to take upon oneself; undertake or take on or over (a position, responsibility, etc) to assume office
3.
to pretend to; feign he assumed indifference, although the news affected him deeply
4.
to take or put on; adopt the problem assumed gigantic proportions
5.
to appropriate or usurp (power, control, etc); arrogate the revolutionaries assumed control of the city
6.
(Christianity) (of God) to take up (the soul of a believer) into heaven
Derived Forms
assumable, adjective
assumer, noun
Word Origin
C15: from Latin assūmere to take up, from sūmere to take up, from sub- + emere to take
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for assuming

assume

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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