This is the 5713th most frequent Polish word.
wyjątkowy
Exceptional; unique.
Here 'wyjątkowy' is used to describe a day as 'special' or 'unique'.
To jest wyjątkowy dzień.
This is a special day.
'Wyjątkowy' in this sentence emphasizes the outstanding nature of the person's talent.
On ma wyjątkowy talent do gry na pianinie.
He has an exceptional talent for playing the piano.
In this usage, 'wyjątkowy' conveys a sense of personal importance or sentiment towards the gift.