A definition cannot he said to match or to not match real world conditions.

Like if I define a square as a quadrilateral with equal sides, that’s independent (orthogonal, even, pun intended) of whether any quadrilaterals with equal sides are around.

I don’t think it makes any sense to talk about whether a definition reflects reality. That’s not really what a definition is. They can’t be true or untrue.

Statements are true or untrue, but for a definition the concept of truth or falsity doesn’t make sense.