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English definition of “main”

main

adjective [before noun]     /meɪn/
B1 larger, more important, or having more influence than others of the same type: The main thing is not to worry. One of the main reasons I came to England was to study the language. You'll find the main points of my proposal in the report. Our main aim/objective is to improve the company's productivity. The main problem in the health service is lack of resources. My main concern about moving to London is the cost of housing.Very important or urgent
(Definition of main adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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