Defiant

Defiant could be:
 * One of the various Federation starships of that name:
 * USS Defiant NCC-1764 ''(TOS era; also seen on ENT)
 * USS Defiant NX-74205 (DS9 prototype ship)
 * USS Defiant NCC-75633 (replaced the NX-75633)
 * The Defiant class escort, a Federation starship type