What does "frank" mean?

Frank: Unbounded by restrictions, limitations, etc.; free. [R.] "It is of frank gift." Spenser.

Additional senses

  1. 2.Free in uttering one's real sentiments; not reserved; using no disguise; candid; ingenuous; as, a frank nature, conversation, manner, etc.
  2. 3.Liberal; generous; profuse. [Obs.] Frank of civilities that cost them nothing. L'Estrange.
  3. 4.Unrestrained; loose; licentious; -- used in a bad sense. Spenser. See Candid, Ingenuous.
  4. 5.To send by public conveyance free of expense. Dickens.
  5. 6.To extempt from charge for postage, as a letter, package, or packet, etc.
  6. 7.The privilege of sending letters or other mail matter, free of postage, or without charge; also, the sign, mark, or signature denoting that a letter or other mail matter is to free of postage. I have said so much, that, if I had not a frank, I must burn my letter and begin again. Cowper.
  7. 8.(Ethnol.) A member of one of the German tribes that in the fifth century overran and conquered Gaul, and established the kingdom of France.
  8. 9.A native or inhabitant of Western Europe; a European; -- a term used in the Levant.
  9. 10.A French coin. See Franc.

Sources