Real Dictionary

frank
When a letter or parcel is franked, it is marked with a symbol that shows that the proper charge has been paid or that no stamp is needed.
adjective: If someone is frank, they state or express things in an open and honest way.

Frank in American English 1
a masculine name: dim. Frankie
free in giving; generous
adjective: direct and unreserved in speech; straightforward; sincere
noun: a member of a group of ancient Germanic peoples dwelling in the regions of the Rhine, one division of whom, the Salians, conquered Gaul about a.d.500, founded an extensive kingdom, and gave origin to the name France
noun: 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
transitive verb: 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

Frank in American English 2
a member of the group of related Germanic peoples that established the Frankish Empire, which, at its height (beginning of the 9th cent. a.d.), extended over what is now France, Germany, and Italy
noun: a frankfurter
noun: a male given name, form of Francis or Franklin

Frank in American English 3
Anne1929-45; Jewish victim of the Holocaust, born in Germany: known for diary (published 1947) kept while in hiding in Amsterdam (1942-44): died in Bergen-Belsen

Frank in American English 4
Frankish

frank in British English
adjective: honest and straightforward in speech or attitude

Frank in British English 1
noun: a member of a group of West Germanic peoples who spread from the east bank of the middle Rhine into the Roman Empire in the late 4th century ad, gradually conquering most of Gaul and Germany. The Franks achieved their greatest power under Charlemagne

Frank in British English 2
noun: Anne. 1929–45, German Jew, whose Diary (1947) recorded the experiences of her family while in hiding from the Nazis in Amsterdam (1942–44). They were betrayed and she died in a concentration camp

Frank. in American English
abbreviation: Frankish