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defender someone who believes in and supports a person, plan, idea, or the like. [4 definitions]
defenestration the act of throwing someone or something out of a window.
defense the act of defending. [5 definitions]
defenseless combined form of defense.
defense mechanism in psychology, an unconscious process that submerges or opposes ideas or actions that would be painful or inappropriate. [2 definitions]
defensible capable of being defended or justified.
defensive suitable for or serving as a defense. [4 definitions]
defensive back a player in American football, whose primary role is to deflect or intercept passes. [2 definitions]
defer1 to put off until a later time or date; postpone. [3 definitions]
defer2 to submit or yield to the desire, opinion, or judgment of another.
deference respect for and submission to the desires, opinions, or judgments of another. [2 definitions]
deferential characterized by or showing deference; respectfully submissive.
deferment the act of putting off or delaying; postponement. [2 definitions]
defiance resistance against authority; insubordination; rebellion. [3 definitions]
defiant characterized by a bold disregard or contempt for authority or opposition; refusing to obey.
defibrillate to stop the fibrillation of (a heart), usu. by administering electric shock.
deficiency the quality or condition of lacking something required; insufficiency or incompleteness. [2 definitions]
deficiency disease a disease caused by lack of a specific nutrient in the diet, or by the body's inability to absorb or metabolize it.
deficiency judgment a judicial decision in favor of a creditor for that part of a debt not satisfied by the debtor, esp. following the foreclosure and sale of a mortgage property.
deficient lacking some essential part, element, or characteristic. [2 definitions]
deficit an amount by which something is less than what is required or expected, esp. the amount by which income is less than expenses.