I Must Be A Biologist

I can define [woman]. /flex

Not just one or two ways, but several ways, depending on what you're trying to do. For example, the point of a woman for most men is someone you can get married to and have kids (and have the kid-making process with). This means barren women aren't women, but never mind. That's just how definitions do.

If you're a bar slut, a woman is someone you'd like to hit on. This means lots of women aren't women, which is why they usually use some kind of slang, or specify "hot" chicks. 

I define [woman] as something which supreme courts don't have. Women aren't judges. (Though they do like being judgmental...) If an institution includes women, it must not be a judging institution. 

P.S. If you're not a biologist, you can't define women. If you can't not-define women, by modus tollens, you must be a not-not biologist. QED.