Take the sense in which I talk of a cricket bat and a cricket ball and a cricket umpire. The reason that all are called by the same name is perhaps that each has a part--its own special part--to play in the activity called cricketing: it is no good to say that cricket simply means 'used in cricket': for we cannot explain what we mean by 'cricket' except by explaining the special parts played in cricketing by the bat, ball &c. Aristotle's suggestion was that the word 'good' might be used in such a way: in which case it is obvious how far astray we should go if we look for a 'definition' of the word 'good' in any ordinary simple sense: or look for the way in which 'good' things are 'similar' to each other, in any ordinary sense.
--J.L. Austin, "The Meaning of a Word"
--J.L. Austin, "The Meaning of a Word"