apportionment, arrest, arrestation, budgeting, check, constraint, control, cooling, cooling down, cooling off, curb, curtailment, cutting, cutting the pie, deceleration, dividing, division, divvy, hindrance, inhibition, injunction, interdict, legal restraint, monopoly, parceling, partition, partitioning, portioning, prohibition, protection, protectionism, protective tariff, rein, repartition, restraint, restraint of trade, retardation, retrenchment, self-control, sharing, sharing out, slicing, slowing down, splitting, tariff wall, thought control

For further exploring for "rationing" in Webster Dictionary Online