1. A day dedicated to commemorating or honoring a special event, person, or occasion with festivities and ceremonies
Christmas is a day of celebration for many people around the world.
O Natal é um dia de celebração para muitas pessoas ao redor do mundo.
2. Any day marked by joy, festivities, or commemorative activities
Her birthday was a day of celebration filled with family and friends.
Seu aniversário foi um dia de celebração cheio de família e amigos.