adjective (a)

• large and roomy (`convenient' is archaic in this sense)(adj.all)

  Example:
  A commodious harbor.
  A commodious building suitable for conventions.
  

  Synonym:
  convenient
  Antonym:
  incommodious
  

  source: wordnet30
• Adapted to its use or purpose, or to wants and necessities; serviceable; spacious and convenient; roomy and comfortable; as, a commodious house.(adjective)

  source: webster1913