One who expects.

expectative / (linguistics) A verb form in some native American languages that implies expectation of an action, as opposed to the report of an action or a general statement about the type of action.

plural of expecter

Relating to expectation.

plural of expecting

Obsolete form of expectable.

plural of expectant

A mandate (given by the Pope or king) that confers the expectation of succession to a benefice

plural of expectative grace

(of a person) The amount of time one is expected to live. / (figuratively, by extension, of an idea or an object) The amount of time something is expected to last.