as·sump·tion     [uh-suhmp-shuhn]  
Show IPA  noun 1. something taken for granted; a 
supposition: a correct 
assumption. Synonyms: presupposition; hypothesis, conjecture, guess, postulate, theory.   
2. the act 
of taking for granted or supposing. Synonyms: 
presumption; presupposition.   
3. the act of 
taking to or upon oneself. Synonyms: acceptance, 
shouldering.   4. the act of taking 
possession of something: the assumption of 
power.  Synonyms: 
seizure, appropriation, usurpation, 
arrogation.   5. 
arrogance; presumption. 
Synonyms: presumptuousness; effrontery, 
forwardness, gall.