The treatment of other people with courtesy and politeness, and showing correct public behaviour.

The treatment of other people in an impolite or discourteous way, or incorrect behaviour in public.

(idiomatic) A person may be judged according to his behaviour towards other people

(dated) To greet a person with a respectful bow or curtsey.

To behave in a rude, ill-mannered way.

(archaic) well-mannered

Familiar from birth with a specified custom, behaviour, accoutrement etc.; naturally suited to it.

(phonetics, of a consonant) the configuration and interaction of the articulators (speech organs such as the tongue, lips, and palate) when making a speech sound

As it were, figuratively speaking, in a manner, in a way, in a certain respect.

(archaic, formal) Under no circumstances whatsoever; not at all.