Meaning of "certain" in Essential American English Dictionary

certain

adjective us /ˈsɜr·tən/

B1 definite:

I am certain that you’re doing the right thing.
It now looks certain that she is going to resign.
→ Opposite uncertain

B1 some:

The museum is only open at certain times of the day.

(Definition of “certain” from the Webster's Essential Mini Dictionary © Cambridge University Press)