presume

Concise Oxford English Dictionary © 2008 Oxford University Press:
presume/prɪˈzjuːm/

▶verb

• 1 suppose that something is the case on the basis of probability.

  ■ take for granted.

• 2 be arrogant or impertinent enough to do something.

  ■ (presume on/upon) unjustifiably regard (something) as entitling one to privileges.

– derivatives
presumable adjective.

– origin ME: from OFr. presumer, from L. praesumere ‘anticipate’ (in late L. ‘take for granted’), from prae ‘before’ + sumere ‘take’.