how do you define a tuxedo cat, is it just black and white?

or are there more qualities to look for?
Answers:
Im sorry you've had some nasty folks give you nasty answers.
Being an owner of 6 cats I tend to do a lot of reading about them.
Yes, a tuxedo cat is just black %26 white. According to an article I read a while ago in Cat Fancy magazine it doesn't matter how much black or white is on the cat either; just so long as there are only those 2 colors the cat is considered a tux.
LL

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A bicolor cat has white fur combined with fur of some other colour, for example black or tabby. There are various patterns of bicolor cat. These range from Van pattern (colour on the crown of the head and the tail only) through to solid colour with a throat locket. The tuxedo pattern is one of many possible bicolor patterns.

Where there is low-to-medium grade white spotting limited to the face, paws, throat and chest of an otherwise black cat, they are known in the United States as a tuxedo cat. High grade bicolor results in Van-pattern cats. There are many patterns between such as cap-and-saddle, mask-and-mantle and magpie (more randomly splashed). Bicolors are found in many breeds as well as being common in domestic longhair cats and domestic shorthair cats.

Solid color bicolor cats occur because there is a white spotting gene present along with a recessive allele of the agouti gene, which evens out the usual striped pattern of the colors of the coat. In contrast, tabby cats have an agouti gene that produces striping of the coat. The Abyssinian has agouti with dilution (ticked tabby), giving the appearance of even colour with color-banded hairs.

White spotting can also occur with any of the tabby patterns, resulting in tabby-and-white bicolors. Colorpoint (Himalayan pattern) cats can have bicolor points although this variation is not recognised for exhibition. The body markings of bicolor colorpoints become clearer with age as the body fur of colorpoint cats darkens as the cats grow older and the white patches become more visible.

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I usually think of a tuxedo cat as having a white "bib" on the chest; they may have white paws, and perhaps a white tip on the tail. Since it's not a recognized breed, it's pretty much whatever looks right to you.

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more black than white..mine is male and very strong and determined.but has been tamed from a nasty neighbor cat who hunted a lot, to a love bug..just needed a good home w/lots of attention.but very determined.