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base

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noun [countable] American English pronunciation: base /beɪs/ 
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singularbase
pluralbases
 
  1. 1
    the bottom part, edge, or surface of something

    a tall cliff, with a narrow footpath at its base

    base of:

    The pituitary gland is at the base of the brain.

    The manufacturer's name is printed on the base of the vase.

    1. a.
      the bottom part or section of something, that supports the rest of it

      The statue stands on a large round base.

      base of:

      The base of the castle is solid rock.

  2. 2
    a place from which an activity can be planned, started, or carried out
    base for:

    Terrorists had been using the warehouse as a base for their operations.

    Hikers find this a convenient base for their mountain expeditions.

  3. 3
    a set of ideas, facts, achievements, etc. from which something can develop

    Income from magazine publishing provides the company with a strong financial base.

    base for:

    The report will give us a base for building a better healthcare system.

    base of:

    a broad base of experience/knowledge/expertise

  4. 6
    a food or substance that is the main food or substance to which other things are added

    Use the stock as a base for your sauce.

    paint with a water base

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