suppose

Concise Oxford English Dictionary © 2008 Oxford University Press:
suppose/səˈpəʊz/

▶verb

• 1 think or assume that something is true or probable, but without proof.

  ■ (of a theory or argument) assume or require that something is the case as a precondition.

  ■ [in imper.] used to introduce a suggestion.

• 2 (be supposed to do something) be required or expected to do something.

– derivatives
supposable adjective.

– origin ME: from OFr. supposer, from L. supponere, from sub- ‘from below’ + ponere ‘to place’.