noun (n)

• the property of being wide; having great width(noun.attribute)

  Synonym:
  broadness
  Antonym:
  narrowness
  

  source: wordnet30
• unusual largeness in size or extent or number(noun.attribute)

  Synonym:
  enormousness, grandness, greatness, immenseness, immensity, sizeableness, vastness
  

  source: wordnet30
• The quality or state of being wide; breadth; width; great extent from side to side; as, the wideness of a room.(noun)

  source: webster1913