1. A day filled with enjoyment, amusement, and pleasure; a day spent doing enjoyable activities
We had a fun day at the amusement park.
Tivemos um dia divertido no parque de diversões.
2. A day characterized by laughter, entertainment, and good times
The children had a fun day playing in the park.
As crianças tiveram um dia divertido brincando no parque.