noun (n)

• the right to enter(noun.attribute)

  Synonym:
  access, accession, admission, entree
  

  source: wordnet30
• the act of admitting someone to enter(noun.act)

  Synonym:
  admission
  

  source: wordnet30
• The act of admitting.(noun)

  source: webster1913
• The reciprocal of impedance.(noun)

  source: webster1913