Usually means: Unit of power, trillion watts.
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We found 3 dictionaries that define the word petawatt:

General (3 matching dictionaries)
  1. Petawatt: Wikipedia, the Free Encyclopedia
  2. petawatt: Oxford Learner's Dictionaries
  3. petawatt: Wiktionary

Definitions from Wiktionary (petawatt)

noun:  (metrology) An SI unit of power equal to 10¹⁵ watts. Symbol: PW

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