Fetching details from the dictionary...

natural; right; proper; just; reasonable; appropriate; deserved
naturally; as a matter of course; rightly; deservedly; justly; of course
努力すれば成功するのは当然だ。
It's natural that effort leads to success.
当然のように毎日勉強している。
I study every day as a matter of course.
彼が怒るのは状況を考えれば当然のことだ。
It's natural for him to be angry.