Forming an exception; not ordinary; uncommon; rare.
What an exceptional meal!
Better than the average; superior due to exception or rarity.
The quality of the beer was exceptional.
Corresponding to something of lower dimension under a birational correspondence.
an exceptional curve; an exceptional divisor
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.
From exception + -al.
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