The word 'supposition' has several distinct senses: 1: a hypothesis that is taken for granted; 2: the cognitive process of supposing; 3: a message expressing an opinion based on incomplete evidence
Logical supposition occurs when a term refers to something as it exists logically.
something that is assumed, an opinion without any definite foundation
What people suppose must be. Often the word is used to relate to ideas based on little evidence or fact.
Guesses