manner · noun /ˈmæn.ər/
manner (WAY)
B2 no plural the way something happens or something is done
Dictionary examples:
She stared at me in an accusing manner.
They dealt with the problem in a very efficient manner.
Learner example:
I don't know if you [will] follow my advice, but [in] whichever manner you spend the money, I [hope] you are glad. (First Certificate in English; B2; Greek)
manners
B2 polite ways of behaving with other people
Dictionary examples:
It's bad manners to eat with your mouth open.
It's considered good manners in some societies to leave a little food on your plate.
Learner example:
Professional waiters are polite, tolerant and show good manners. (First Certificate in English; B2; Russian)
manner (BEHAVIOR)
B2 no plural the way in which a person talks and behaves with other people
Dictionary examples:
an aggressive/friendly/rude manner
As soon as he realized that we weren't going to buy anything, his whole manner changed.
Learner example:
I stared at him in anger, and the poor man, afraid of my rude manner, went out [of] the cafe. (First Certificate in English; B2; Spanish)