Usually means: Highest piston position in cylinder.
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We found 5 dictionaries that define the word top dead center:

General (3 matching dictionaries)
  1. top dead center: Oxford Learner's Dictionaries
  2. top dead center: Wiktionary
  3. Top dead center: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. top dead center: Encyclopedia

Tech (1 matching dictionary)
  1. AUTOMOTIVE TERMS (No longer online)

Definitions from Wiktionary (top dead center)

noun:  (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.
noun:  (mechanical) The reference mark on a flywheel (and engine block) indicating the engine is in this position, when aligned.

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