الحركة كونان في آنين في مكانين، والسكون كونان في آنين في مكان واحد
Motion is occupation of two places at two instants; rest is occupation of one place at two instants.
If a body occupies place A at one instant and place B at another, it is classified as moving. If it occupies A at both instants, the relationship is rest. The reference to two instants matters because the distinction requires comparing successive states.
This is one classical analysis, not a direct statement of modern mechanics. A philosophical critic may characterize motion as a continuous transition rather than the sum of fully discrete occupancies.