override

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To ride across.
2. v. To ride beyond.
3. v. To trample on.
4. v. To ride (a horse) too hard.
5. v. To prevail over; conquer: Budgetary concerns overrode all other considerations.
6. v. To declare null and void; set aside: overrode the President's veto.
7. v. To counteract the normal operation of (an automatic control).
8. v. To extend over; overlap.
9. n. A sales commission collected by an executive in addition to the commission received by a subordinate salesperson.
10. n. See royalty.
11. n. A mechanism or system used to counteract an automatic control.
12. n. The act or an instance of nullifying.

Century Dictionary and Cyclopedia

1. To ride over; hence, to trample down; supersede: as, a decision that overrides all previous decisions.
2. To ride too much; fatigue by riding.
3. To outride; pass in riding.
4. In surgery, to overlap: said of a fragment of a broken bone in relation to another fragment.

Wiktionary

1. v. To ride across or beyond something.
2. v. To ride a horse too hard.
3. v. To counteract the normal operation of something.
4. v. software To define a new behaviour of a method by creating the same method of the superclass with the same name and signature.
5. n. A mechanism, device or procedure used to counteract an automatic control.
6. n. A royalty.
7. n. A device for prioritizing audio signals, such that certain signals receive priority over others.

GNU Webster's 1913

1. v. To ride over or across; to ride upon; to trample down.
2. v. To suppress; to destroy; to supersede; to annul; to nullify
3. v. To countermand; to overrule.
4. v. To replace (one system with another).
5. v. obsolete To ride beyond; to pass; to outride.
6. v. To ride too much; to ride, as a horse, beyond its strength.

WordNet 3.0

1. v. prevail over
2. n. the act of nullifying; making null and void; counteracting or overriding the effect or force of something
3. n. a manually operated device to correct the operation of an automatic device
4. v. ride (a horse) too hard
5. v. counteract the normal operation of (an automatic gear shift in a vehicle)
6. v. rule against