Learner's definition of COMBINATION
1 [count] : a result or product of combining two or more things or people
Water is a combination of hydrogen and oxygen.
The car's interior is available in various/different color combinations.
It's an unusual combination.
A combination of factors led to her decision.
The milkshakes come in chocolate, strawberry, and vanilla, or any combination of these.
He has the right combination of talent and experience.
Together on one team they are a winning combination. [=they work, perform, etc., very well together]
2 : an act of combining two or more things
3 [count] : a particular series of numbers or letters that is used to open a lock 4 — used before a noun to describe something that can be used in more than one way