A1 necessary or of great value:
I think his career is more important to him than I am.
It's important for children to learn to get on with each other.
The important thing is to keep the heat low or the sugar will burn.
He's not amazingly handsome, but he's nice and that's more important.
Opposite
unimportant
B1 having great effect or influence:
He was one of the most important writers of that period.
an important person/decision