Longman Dictionary of Contemporary English homepage

mainly

adverb
     
main‧ly S2 W2
used to mention the main part or cause of something, the main reason for something etc:
Her illness was caused mainly by stress.
The workforce is mainly made up of women.
I don't go out much, mainly because I have to look after the kids.
Increased sales during the summer were mainly due to tourism.
We talked about various things - work, mainly.

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