tool - definition and synonyms

noun [countable] 

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  1. 1
    a piece of equipment, usually one that you hold in your hand, that is designed to do a particular type of work

    a set of tools

    See also machine tool
  2. 2
    something that you use in order to perform a job or to achieve an aim
    tool of:

    Speech is a tool of communication.

    a tool for:

    These sales forecasts are an extremely useful tool for management.

    tool for doing something:

    Words are essential tools for formulating and communicating thoughts.

  3. 4
    impolite a penis