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Phonetics
/ɪkˈsɛpʃənəl/
noun
An exception, or something having an exceptional value
adjective
Forming an exception; not ordinary; uncommon; rare.
Example: What an exceptional flower!Better than the average; superior due to exception or rarity.
Example: The quality of the beer was exceptional.Corresponding to something of lower dimension under a birational correspondence.
Example: an exceptional curve; an exceptional divisor