a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
1639, "owner, by royal grant, of an American colony," probably from proprietary (n.) in sense "property owner" (1473, see proprietary). In general sense of "one who holds something as property" it is attested from 1645.