top dead center

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English

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Noun

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top dead center (uncountable)

  1. (mechanical) A position in the cycle of a piston engine wherein the piston is at the topmost point in its stroke. In a four-stroke cycle, TDC occurs twice: at the end of the compression stroke and at the end of the exhaust stroke.
    Synonym: TDC (initialism)
    Antonyms: bottom dead center, BDC
    Hypernym: dead center
  2. (mechanical) The reference mark on a flywheel (and engine block) indicating the engine is in this position, when aligned.
    Synonym: TDC (initialism)
    Antonyms: bottom dead center, BDC
    Hypernym: dead center

Translations

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