mail on which the postage is printed directly on an envelope or label by a machine licensed by the postal service.
Origin of metered mail
First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
mail franked privately, under licence, with a machine bearing special markings (meter marks)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012