Question

an inequality that includes variables and
represents a relationship where one
variable does not strictly equal another.

Explanation:

This fills the blank to complete the definition: an inequality with variables and inequality symbols expresses a non-strict equality relationship between variables, where one variable is less than, greater than, less than or equal to, or greater than or equal to the other, rather than strictly equal.

Answer:

inequality symbols (such as $<$, $>$, $\leq$, $\geq$)