1 [singular] (formal) the way that something is done or happensShe answered in a businesslike manner.The manner in which the decision was announced was extremely regrettable.2 [singular] the way that somebody behaves towards other peopleto have an aggressive/a friendly/a relaxed mannerHis manner was polite but cool. see also bedside manner3 manners [plural] behaviour that is considered to be polite in a particular society or cultureto have good/bad mannersIt is bad manners to talk with your mouth full.He has no manners(= behaves very badly).She could at least have the good manners to let me know she won't be able to attend. see also table manners4 manners [plural] (formal) the habits and customs of a particular group of peoplethe social morals and manners of the seventeenth century
all manner of somebody/something
many different types of people or thingsThe problem can be solved in all manner of ways.He enjoyed interacting with all manner of different people.
in a manner of speaking
if you think about it in a particular way; true in some but not all waysAll these points of view are related, in a manner of speaking.