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battery

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noun battery pronunciation in American English /ˈbæt(ə)ri/ 
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singularbattery
pluralbatteries
  1. 1
    [countable] an object that fits into something such as a radio, clock, or car and supplies it with electricity

    I need some new batteries for my Walkman.

    The battery is dead (=no longer working).

    charge/recharge a battery (=provide it with power):

    Maybe it won't start because the battery needs recharging.

  2. 4
    [singular] a group of similar things
    battery of:

    He put her through a battery of tests.

pre-roll

a video advertisement that appears immediately before an online video

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