Good character consists of recognizing the selfishness that inheres in each of us and trying to balance it against the altruism to which we should all aspire. It is a difficult balance to strike, but no definition of goodness can be complete without it.
In computing, turning the obvious into the useful is a living definition of the word 'frustration'.
My friend Harry Nilsson used to say the definition of an artist was someone who rode way ahead of the herd and was sort of the lookout. Now you don't have to be that, to be an artist. You can be right smack-dab in the middle of the herd. If you are, you'll be the richest.
The definition of being a feminist is equality, and if you're not a feminist at this point, then what are you really promoting?
My definition of sexy is someone who is expressing themselves honestly.
The definition of hate speech in some countries is problematic.
Syria is a terrorist state by any definition and is so classified by the State Department. I happen to think Iran is too. Iraq, Iran, Syria, they're all involved.
The deepest definition of youth is life as yet untouched by tragedy.