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energy

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noun British English pronunciation: energy /ˈenə(r)dʒi/ 
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singularenergy
pluralenergies
  1. 1
    [uncountable] a supply of physical power that you have for doing things that need physical effort

    As children we seemed to have endless energy.

    She didn't even have the energy to get out of bed.

    1. a.
      [countable/uncountable] enthusiasm and determination

      She could offer youthful energy and talent in abundance.

      put/devote/throw your energy/energies into something:

      Christine threw her energies into her teaching.

  2. 2
    [uncountable] science a form of power such as electricity, heat, or light that is used for making things work

    Insulating your home is a good way to save energy.

    Environmentally friendly energy sources include water and wind power.

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