All 5 Uses

unprecedented
in
Seabiscuit, by Hillenbrand
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Necessity spurred technological innovations that offered the public unprecedented access to its heroes.†
Chpt 2.9 *

unprecedented = not having happened before; or nothing similar having happened before
His first effort was to maximize his horse's exposure, plotting an exhaustive cross-country racing campaign that was probably unprecedented in scope, adopting a take-all-comers attitude in choosing Seabiscuit's races and opponents, and even running full-page ads celebrating Seabiscuit's wins.†
Chpt 2.9
They bought up advance seats at an unprecedented pace, packed into special trains, and crammed into the track in record numbers to see the horse they called "the Great Traveler."†
Chpt 2.16
The action was unprecedented; no one had ever seen stewards treat a trainer with such blatant distrust.†
Chpt 2.16
When jockey Kurtsinger launched War Admiral in his finaldrive for the wire, Pollard said, do something completely unexpected and probably unprecedented: Let him catch up.†
Chpt 2.18

Definitions:

(1) (unprecedented)
not having happened before; or nothing similar having happened before
(2) (meaning too rare to warrant focus)