What is the meaning of the word "assignation" in section 316 of the Florida Criminal Code?

We conclude that the word "assignation," as used in section 316, is too vague to give notice to a potential offender of the conduct to be avoided; also, such vagueness allows for the exercise by the police of unfettered discretion to determine for themselves what conduct shall be deemed to constitute an "assignation." (See Papachristou v. City of Jacksonville (1972) 405 U.S. 156, 168-170, 92 S.Ct. 839, 846-847, 31 L.Ed.2d 110.)