Meaning of “exceptional” - Learner’s Dictionary

exceptional

adjective uk us /ɪkˈsepʃənəl/
GOOD

B2 extremely good:

an exceptional student
UNUSUAL

B2 very unusual and not likely to happen very often:

Visitors are only allowed in exceptional circumstances.
exceptionally adverb

an exceptionally gifted pianist

(Definition of “exceptional” from the Cambridge Learner’s Dictionary © Cambridge University Press)