English to English

noun (n)

• the act of making something wider(noun.act)

  Synonym:
  widening
  Antonym:
  narrowing
  

  source: wordnet30
• the action of making broader(noun.act)

  Example:
  The broadening of travel.
  

  source: wordnet30
• an increase in width(noun.process)

  source: wordnet30