indeterminate forms; definition

$\lim_{x\to 0} \frac{x}{x}$ is an indeterminate form whereas $\lim_{x\to 0} \frac{[x^2]}{x^2}$ is not an interminate form (where $[x]$ represents the greatest integer function

Why is $\lim_{x\to 0} \frac{[x^2]}{x^2}$ not in indeterminate form?

As far as I know, $\frac{[x^2]}{x^2}$ gives a $\frac{0}{0}$ at $0$. What is the exact definition of 'indeterminate form'? Wikipedia does not help answer this question.