<p><strong>Adjective</strong></p><ul><li>direct and unreserved in speech; straightforward; sincere: Her criticism of my work was frank but absolutely fair.</li><li>Synonyms: blunt, naked, uninhibited, bold, free, unguarded</li><li>Antonyms: restrained, inhibited, guarded</li><li>without inhibition or subterfuge; transparent; undisguised: The letter contained a frank appeal for financial aid.</li><li>Pathology: clinically evident; unmistakable: frank blood.</li><li>Archaic: liberal or generous.</li><li>Obsolete: free.</li></ul><p><strong>Noun</strong></p><ul><li>a signature or mark affixed by special privilege to a letter, package, or the like to ensure its transmission free of charge, as by mail.</li><li>the privilege of having letters, packages, etc., transmitted free of charge.</li><li>a letter, package, etc., transmitted free of charge by special privilege.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) to mark (a letter, package, etc.) for transmission free of the usual charge, by virtue of official or special privilege; send free of charge, as mail.</li><li>to convey (a person) free of charge.</li><li>to enable to pass or go freely: to frank a visitor through customs.</li><li>to facilitate the comings and goings of (a person), especially in society: A sizable inheritance will frank you faster than anything else.</li><li>to secure exemption for.</li><li>Carpentry: to assemble (millwork, as sash bars) with a miter joint through the moldings and a butt joint or mortise-and-tenon joint for the rest.</li></ul>