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Meaning of fastback

fast•back

Pronunciation: (fast'bak", fäst'-), [key]
— n.
  1. a form of back for an automobile body consisting of a single, unbroken convex curve from the top to the rear bumper.
  2. a car having such a back. Cf. notchback.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.