WordNet (r) 3.0 (2006):

FL
    n 1: a state in southeastern United States between the Atlantic
         and the Gulf of Mexico; one of the Confederate states
         during the American Civil War [syn: Florida, Sunshine
         State, Everglade State, FL]

The Free On-line Dictionary of Computing (19 January 2023):

FL

    Function Level.

   John Backus's successor to FP, developed ca. 1985.  FL is
   dynamically typed and adds higher-order functions,
   exceptions, user-defined types and other features.

   ["FL Language Manual, Parts 1 & 2", J. Backus et al, IBM
   Research Report RJ 7100 (1989)].

   (1994-10-20)