o·ver·ride 
(ō′vər-rīd)
(ō′vər-rīd)tr.v. o·ver·rode (-rōd), o·ver·rid·den (-rĭdn), o·ver·rid·ing, o·ver·rides
1.
a. To ride across.
b. To ride beyond.
2. To trample on.
3. To ride (a horse) too hard.
4.
a. To prevail over; conquer: Budgetary concerns overrode all other considerations.
b. To declare null and void; set aside: overrode the president's veto.
c. To counteract the normal operation of (an automatic control).
5. To extend over; overlap.
n. (ōvər-rīd′)
1. A sales commission collected by an executive in addition to the commission received by a subordinate salesperson.
2. See royalty.
3. A mechanism or system used to counteract an automatic control.
4. The act or an instance of nullifying.