Etymology
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override (v.)

Middle English overriden, from Old English oferridan "to ride across, ride through or over," from ofer "over" (see over) + ridan "to ride" (see ride (v.)). Originally literal, of cavalry, etc. Figurative meaning "to set aside arrogantly" is by 1827, from the notion of "to trample down," hence "supersede." The mechanical sense "to suspend automatic operation" is attested from 1946. As a noun in the sense "act or process of suspending automatic operation," from 1946. Related: Overrode; overriding; overridden.

And þanne þeze Frenschmen come prikkyng doun as þei wolde haue ouyr-rydyn alle oure meyne; but God and our archers made hem sone to stomble. [Layamon, from the description of the Battle of Agincourt in "The Brut, or The Chronicles of England"] 

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Definitions of override
1
override (v.)
rule against;
override (v.)
prevail over;
health considerations override financial concerns
override (v.)
counteract the normal operation of (an automatic gear shift in a vehicle);
override (v.)
ride (a horse) too hard;
2
override (n.)
a manually operated device to correct the operation of an automatic device;
override (n.)
the act of nullifying; making null and void; counteracting or overriding the effect or force of something;
Synonyms: nullification
From wordnet.princeton.edu