1. adjective /fɹæŋk/
Honest, especially in an manner that seems slightly blunt.
May I be frank with you?
2. noun /fɹæŋk/
a) Free postage, a right exercised by governments (usually with definite article).
Buy a package of franks for the barbecue.
b) The notice on an envelope where a stamp would normally be found.
3. verb /fɹæŋk/
To place a frank on an envelope.
“<!...It will be so ridiculous to see all his letters directed to him with an M.P.—But do you know, he says, he will never frank for me?<!...”
See Also: cocktail frank
Wikipedia foundation.