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- This page details Constitution class in the mirror universe; for Constitution class in the primary universe see Constitution class; for Constitution class in the Kelvin timeline created by Nero's temporal incursion see Constitution class (alternate reality); for Constitution class in all other alternate universes see Constitution class (alternates).
The Constitution-class was a heavy cruiser starship in the service of the Terran Empire service in the 22nd century and 23rd century. The design was originally obtained by the Imperial Starfleet when the USS Defiant was transported to the mirror universe through a dimensional and temporal interphase. (TOS episode: "Mirror, Mirror", ENT episode: "In a Mirror, Darkly")