What is the meaning of Postmarking?

(p.pr.&vb.n.) of Postmark.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). postmarking. Retrieved September 20, 2026, from http://smartdefine.org/postmarking/definitions/2047847
ChicagoWebster's. 2011. "postmarking" http://smartdefine.org/postmarking/definitions/2047847 (accessed September 20, 2026).
HarvardWebster's 2011, postmarking, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/postmarking/definitions/2047847>.
MLAWebster's. "postmarking" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/postmarking/definitions/2047847>