noun

1. An exception, or something having an exceptional value

adjective

1. Forming an exception; not ordinary; uncommon; rare.

   “What an exceptional flower!”

2. Better than the average; superior due to exception or rarity.

   “The quality of the beer was exceptional.”

3. Corresponding to something of lower dimension under a birational correspondence.

   “an exceptional curve; an exceptional divisor”

Synonyms: egregious