1) Strict definition: An irrational bias towards members of a racial background. The bias can be positive (e.g. one race can prefer the company of its own race or even another) or it can be negative (e.g. one race can hate another). To qualify as racism, the bias must be irrational. That is, it cannot have a factual basis for preference.
2) Commonly intended definition(in America): A bias that white people have against blacks.
3) Politically motivated definition: A justifiable reason to redistribute resources or opportunities between groups on the basis of race alone.
2) One is a racist for pointing out #1 *IF* there is no reason for pointing it out other than to make black people feel inferior.
3) Racism is the reason that a 20 on the ACT should actually be considered a 25 if the test taker was black.
In modern use, this word is used by people to explain the behaviour of people of other races, whether race is called into the issue or not.
Also: racism can now also include having good race relations. If you try to be friends with someone of a different race, someone will call you a racist.
Me: How is that racism? I was going to say that I met this black dude when I was going to see my best friend, who's asian.
Idiot: You're just friends with that asian because you think that makes you a good person for not being racist! You must feel sorry for him, you goddamn racist!
Me: Race doesn't come into it. But people like you force race issues into everything.
"Black" people often acuse "white" people of being racist when things don't go their way or when they want something.
If you think this definiton has been racist, you are very stupid.