Definition of “contain” - Learner’s Dictionary

contain

verb [ T ] us uk /kənˈteɪn/
Extra Examples
This product contains only natural ingredients.Coffee contains caffeine which is a stimulant.The water contains unacceptable levels of pollution.Your stomach contains acid to help you digest your food.The museum contains some of his best creations.
INSIDE

B1 If one thing contains another, it has it inside it:

He gave her a box containing a diamond ring.
PART

B2 to have something as a part:

Does this drink contain alcohol?
CONTROL

to control something by stopping it from spreading:

The police were unable to contain the fighting.
EMOTION

to control your emotions:

He could barely contain his anger.
[ often reflexive ] I could not contain myself any longer.

(Definition of “contain” from the Cambridge Learner's Dictionary © Cambridge University Press)