Learner's definition of BRIGHT
producing a lot of light
filled with light
having a very light and strong color
able to learn things quickly
— used especially to describe a young person
— often used in a joking or ironic way to describe a foolish idea, action, etc.
providing a reason for hope
a young actress with a bright [=promising] future
Brighter days are ahead. [=things will improve in the future]
The prospects for the team are bright. [=good]
bright-eyed and bushy-tailed
happy and full of energy
a good thing that occurs during a bad or difficult time
on the bright side
— used to refer to the good part of something that is mostly bad
(US) He lost the race, but on the bright side, he didn't get hurt.
Your cat is very sick right now, but try to look on the bright side. She can be treated with medicine.