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What is a top dead center?

What is a top dead center? Here are some definitions.

Noun
  1. (automotive) A position in the four-stroke combustion process wherein the piston is at the topmost point in its stroke. This can either be during the compression phase or the combustion phase.
  2. (automotive) The reference mark on a flywheel (and engine block) indicating the engine is in the top dead center position, when aligned.
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