Cases of word usage

1) to act: conduct oneself in the way mentioned (behave)

2) any important rule of conduct (golden rule)

3) a short sentence or phrase used as a guide or rule of behaviour, as used by a school, club etc or expressed as a personal rule of conduct (motto)

4) (especially) severe or harsh (in judging the conduct of others) (uncharitable)

5) (a particular kind of) evil conduct or practice; an apparatus with strong clamps in which things can be held tightly while being cut, shaped etc; second in authority; deputy (vice)