Definitions of language:

• noun:   the mental faculty or power of vocal communication

  Example: "Language sets homo sapiens apart from all other animals"

• noun:   a systematic means of communicating by the use of sounds or conventional symbols

  Example: "He taught foreign languages"

• noun:   the cognitive processes involved in producing and understanding linguistic communication

  Example: "He didn't have the language to express his feelings"

• noun:   a system of words used in a particular discipline

  Example: "The language of sociology"

• noun:   the text of a popular song or musical-comedy number

  Example: "The song uses colloquial language"

• noun:   (language) communication by word of mouth

  Example: "He uttered harsh language"