It could be undefined if you do not know the original number of which the "proportion" was meant to be out of.
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it was an undefined decission
An undefined slope is just a line straight down. The slope is undefined.
A term that is undefined mean simply that it is not defined. The prefix un means not, and if you add it to the word defined, ta da, you get undefined.
Undefined.
A set can be defined or undefined.