All 3 Uses of

presume
in
For Whom the Bell Tolls

But it is, in a way, presumptuous for a foreigner to teach Spanish," Fernando said.†
Chpt 16 *

presumptuous = exercising privileges to which one is not entitled

We could go into the hotel and register as Doctor and Mrs. Livingstone I presume, he thought.†
Chpt 13

You can't base an operation on the presumption that miracles are going to happen.†
Chpt 38

Definitions:

(1) (presume as in: presumption of innocence)
to think of something as true or likely, even though it is not known with certainty

Something can be presumed because it seems reasonable or because there is a rule or law demanding such an assumption. For example, in the United States someone charged with a crime is presumed by law to be innocent unless they are proven guilty at a trial.
(2) (presumptuous as in: she is presumptuous)
exercising privileges to which one is not entitled -- such as being too familiar or too bossy
(3) (meaning too rare to warrant focus)
meaning too rare to warrant focus