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depth perception the ability to perceive spatial relationships such as the relative distance of objects from one another or from the observer.
depth psychology the psychological study of the unconscious mind.
deputation the act or process of choosing one or several people to act on behalf of another person, group, or other entity such as a government. [2 definitions]
depute to choose as a representative or representatives. [2 definitions]
deputize to authorize to act as an assistant or representative.
deputy someone authorized to be a substitute or assistant. [3 definitions]
deracinate to pull up by or as if by the roots; uproot; isolate; exile.
derail to cause to go off the tracks. [3 definitions]
derailleur a device on some bicycles that moves the chain onto various gears in order to allow easier or more difficult pedaling.
derange to cause to be mentally ill. [3 definitions]
deranged mentally ill; insane.
derby any of numerous horse races run every year and often restricted to three-year-old horses. [3 definitions]
deregulate to abolish regulations governing (something); decontrol.
derelict failing to fulfill one's responsibilities or obligations; remiss. [4 definitions]
dereliction deliberate failure to fulfill one's responsibilities or obligations. [2 definitions]
deride to ridicule or treat with scornful mockery.
de rigueur (French) required by fashion, custom, etiquette, or the like.
derision mockery or ridicule.
derisive ridiculing, mocking, or scoffing.
derivation the act, fact, or process of deriving or being derived. [4 definitions]
derivative produced through derivation. [4 definitions]