Meaning of “combination” - Learner’s Dictionary

combination

noun uk us /ˌkɒmbɪˈneɪʃən/
MIXTURE [ C, U ]

B2 a mixture of different people or things:

Strawberries and cream - a perfect combination!
We won through a combination of luck and skill.
This drug can be safely used in combination with other medicines.
LOCK [ C ]

a set of numbers or letters in a particular order that is needed to open some types of locks:

a combination lock

(Definition of “combination” from the Cambridge Learner’s Dictionary © Cambridge University Press)