exceptional

adj

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

   “What an exceptional meal!”

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

   “The origins of the conditions and disorders that exceptional learners have are not always well understood.”

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

   “The quality of the beer was exceptional.”

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

   “an exceptional curve; an exceptional divisor”

noun

1. An exception, or something having an exceptional value

   “Above and beyond all these exceptionals, by reason of divergencies from the norms of mental and of physical status, there are quite a number of moral defectives.”