Source : Webster's Revised Unabridged Dictionary (1913)

Minimal \Min"i*mal\, a.
   Of, pertaining to, or having a character of, a minim or
   minimum; least; smallest; as, a minimal amount or value.

Source : WordNet®

minimal
     adj : the least possible; "needed to enforce minimal standards";
           "her grades were minimal"; "minimum wage"; "a minimal
           charge for the service" [syn: {minimum}] [ant: {maximal},
            {maximal}]