adjective (a)

• the least possible(adj.all)

  Example:
  Needed to enforce minimal standards.
  Her grades were minimal.
  A minimal charge for the service.
  

  Synonym:
  minimum
  Antonym:
  maximal, maximum
  

  source: wordnet30
• Of, pertaining to, or having a character of, a minim or minimum; least; smallest; as, a minimal amount or value.(adjective)

  source: webster1913