We found one dictionary that defines the word franking machines:

General (1 matching dictionary)

1. franking machines: Collins English Dictionary

(Note: See franking_machine as well.)

Definitions from Wiktionary (franking machine) ▸ noun:  Synonym of postage meter ▸ Also see franking_machine ▸ Words similar to franking machines ▸ Usage examples for franking machines ▸ Idioms related to franking machines ▸ Wikipedia articles (New!) ▸ Words that often appear near franking machines ▸ Rhymes of franking machines ▸ Invented words related to franking machines