assume

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To take for granted; suppose.
• intransitive verb To take upon oneself (a duty or obligation).
• intransitive verb To undertake the duties of (an office).
• intransitive verb To take on (an appearance, role, or form, for example); adopt.
• intransitive verb To pretend to have; feign.
• intransitive verb To take over without justification; seize.
• intransitive verb To clothe oneself in; don.
• intransitive verb To take up or receive into heaven.
• intransitive verb To make a supposition; suppose or believe.

from The Century Dictionary.

• To take into relation or association; adopt; take in; admit: as, “Enoch and Elias were assumed up into heaven,” Abp. Abbot. See assumption, 5.
• To take upon one's self; undertake: as, to assume the responsibility of a proceeding; to assume office; to assume an obligation.
• To take or put on one's self; invest one's self with: as, to assume the garb of a mendicant, or the figure of an animal; to assume a severe aspect; “to assume man's nature,”
• To apply to one's self; appropriate.
• To take for granted or without proof; suppose as a fact; postulate: as, to assume a principle in reasoning.
• To take fictitiously; pretend to possess; take in appearance: as, to assume the garb of humility.
• To claim.
• Synonyms To affect, feign, counterfeit.
• To be arrogant; claim more than is due; presume.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb To be arrogant or pretentious; to claim more than is due.
• intransitive verb (Law) To undertake, as by a promise.
• transitive verb To take to or upon one's self; to take formally and demonstratively; sometimes, to appropriate or take unjustly.
• transitive verb To take for granted, or without proof; to suppose as a fact; to suppose or take arbitrarily or tentatively.
• transitive verb To pretend to possess; to take in appearance.
• transitive verb To receive or adopt.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb To authenticate by means of belief; to surmise; to suppose to be true, especially without proof.
• verb To take on a position, duty or form.
• verb To adopt an idea or cause.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb occupy or take on
• verb take to be the case or to be true; accept without verification or proof
• verb take on as one's own the expenses or debts of another person
• verb take on titles, offices, duties, responsibilities
• verb make a pretence of
• verb take up someone's soul into heaven
• verb take on a certain form, attribute, or aspect
• verb put clothing on one's body
• verb seize and take control without authority and possibly with force; take as one's right or possession