noun (n)

• a person who seeks the advice of a lawyer(noun.person)

  source: wordnet30
• someone who pays for goods or services(noun.person)

  Synonym:
  customer
  

  source: wordnet30
• (computer science) any computer that is hooked up to a computer network(noun.artifact)

  Synonym:
  guest, node
  

  source: wordnet30
• A citizen who put himself under the protection of a man of distinction and influence, who was called his patron.(noun)

  source: webster1913