noun (n)

• a friend who is frequently in the company of another(noun.person)

  Example:
  Comrades in arms.
  

  Synonym:
  associate, companion, familiar, fellow
  

  source: wordnet30
• a fellow member of the Communist Party(noun.person)

  source: wordnet30
• used as a term of address for those male persons engaged in the same movement(noun.person)

  Example:
  Greetings, comrade!.
  

  Synonym:
  brother
  

  source: wordnet30
• A mate, companion, or associate.(noun)

  source: webster1913