Longman Dictionary of Contemporary English homepage

combination

 noun
     
com‧bi‧na‧tion S3 W2
1 [uncountable and countable] two or more different things that exist together or are used or put together [↪ combine]
combination of
A combination of factors may be responsible for the increase in cancer.
A combination of tact and authority was needed to deal with the situation.
Certain combinations of sounds are not possible in English.
in combination (with something)
Some drugs which are safe when taken separately are lethal in combination.
2 [countable] the series of numbers or letters you need to open a combination lock
3

winning combination

a mixture of different people or things that work successfully together
4 [uncountable] especially American English used before a noun to mean that something has more than one purpose or uses more than one method:
a combination nightclub and café
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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