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manner
n.
...
3.[pl.]
a) ways of social life; prevailing social conditions or customs (a comedy of manners)
b) ways of social behavior; deportment, esp. with reference to polite conventions (good manners, bad manners)
c) polite ways of social behavior; deportment conforming with polite conventions (a child who has no manners)

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I am guessing that is the definition you wanted