This is the 435th most frequent Italian word.
speciale
Special; unique; exceptional.
'Speciale' is used here as an adjective to describe something as unique or extraordinary.
Questo ristorante è davvero speciale.
This restaurant is truly special.
Here, 'speciale' describes the gift, implying it has unique value or thought put into it.
Ho un regalo speciale per te.
I have a special gift for you.
'Speciale' is describing the day, indicating its significance or importance to the speaker.