v. i. [ imp. & p. p. Expostulated p. pr. & vb. n. Expostulating. ] [ L. expostulatus, p. p. of expostulare to demand vehemently; ex out + postulare to ask, require. See Postulate. ] To reason earnestly with a person on some impropriety of his conduct, representing the wrong he has done or intends, and urging him to make redress or to desist; to remonstrate; -- followed by with. [ 1913 Webster ]

Men expostulate with erring friends; they bring accusations against enemies who have done them a wrong. Jowett (Thuc. ).

Syn. -- To remonstrate; reason. See Remonstrate. [ 1913 Webster ]

v. t. To discuss; to examine. [ Obs. ] [ 1913 Webster ]

To expostulate
What majesty should be, what duty is. Shak. [ 1913 Webster ]

n. [ L. postulatum a demand, request, prop. p. p. of postulare to demand, prob. a dim. of poscere to demand, prob. for porcscere; akin to G. forschen to search, investigate, Skr. prach to ask, and L. precari to pray: cf. F. postulat. See Pray. ] 1. Something demanded or asserted; especially, a position or supposition assumed without proof, or one which is considered as self-evident; a truth to which assent may be demanded or challenged, without argument or evidence. [ 1913 Webster ]

2. (Geom.) The enunciation of a self-evident problem, in distinction from an axiom, which is the enunciation of a self-evident theorem. [ 1913 Webster ]

The distinction between a postulate and an axiom lies in this, -- that the latter is admitted to be self-evident, while the former may be agreed upon between two reasoners, and admitted by both, but not as proposition which it would be impossible to deny. Eng. Cyc. [ 1913 Webster ]

a. Postulated. [ Obs. ] Hudibras. [ 1913 Webster ]

v. t. [ imp. & p. p. Postulated p. pr. & vb. n. Postulating. ] 1. To beg, or assume without proof; as, to postulate conclusions. [ 1913 Webster ]

2. To take without express consent; to assume. [ 1913 Webster ]

The Byzantine emperors appear to have . . . postulated a sort of paramount supremacy over this nation. W. Tooke. [ 1913 Webster ]

3. To invite earnestly; to solicit. [ Obs. ] Bp. Burnet. [ 1913 Webster ]

a. Assumed without proof; as, a postulated inference. Sir T. Browne. [ 1913 Webster ]