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renewable

Anything renewable can be replaced or has an endless supply. Renewable sources of energy don't run out.

Since re means "again," things that are renewable are always fresh and new: the supply can't be used up. This word often applies to energy. Fossil fuels like oil are not renewable resources; we will run out of oil someday. Energy sources like solar and wind power are renewable, because there's always going to be sunlight and wind. Anything renewable is going to last.

Definitions of renewable
  1. adjective
    capable of being renewed; replaceable
    renewable energy such as solar energy is theoretically inexhaustible”
    Synonyms:
    inexhaustible
    incapable of being entirely consumed or used up
  2. adjective
    that can be renewed or extended
    “a renewable lease”
    renewable subscriptions”
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    Antonyms:
    nonrenewable, unrenewable
    that can not be renewed
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