👉 In mathematics, an "indefinable" is a number or symbol that has no value in any meaningful way. It's like saying you can't tell what the value of 3 is without knowing how to add and subtract numbers.
For example, if we're trying to solve a problem involving fractions, but you don't know how to multiply them, then "indefinable" would be a symbol that doesn't have a specific number or value associated with it.
So in
indefinable