1
: marked by free, forthright, and sincere expression
a frank reply
2
a
: unmistakably evident
frank materialism
b
: clinically evident and unmistakable
frank pus
frankness
noun
franked; franking; franks
1
a
: to mark (a piece of mail) with an official signature or sign indicating the right of the sender to free mailing
b
: to mail free
c
: to affix to (mail) a stamp or a marking indicating the payment of postage
2
: to enable to pass or go freely or easily
franker
noun
1
a
: the signature of the sender on a piece of franked mail serving in place of a postage stamp
b
: a mark or stamp on a piece of mail indicating postage paid
c
: a franked envelope
2
: the privilege of sending mail free of charge
: a member of a West Germanic tribal confederacy that entered the Roman provinces in a.d. 253, occupied the Netherlands and most of Gaul, and established themselves along the Rhine
frank·er
ˈfraŋkə(r)
plural -s
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Merriam-Webster unabridged



