限定 (xiàn dìng): to restrict to; to limit

This competition restricts each person to submitting only one entry, so you need to carefully choose the one you're most satisfied with.

The museum restricts visiting time to one group per hour to control the number of people inside and ensure a good experience for visitors.

The company restricted these funds to be used only for purchasing experimental equipment and not for other purposes.

The doctor advised him to limit his daily salt intake to no more than five grams, otherwise his blood pressure would be hard to control.