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defection the act of deserting or renouncing loyalty to something to which one is supposed to be loyal, such as one's country, duty, religion, or party. [2 definitions]
defective having a flaw, error, or other imperfection. [2 definitions]
defence a spelling of defense used in Canada and Britain. See defense for more information.
defend to protect from harm, seizure, or intrusion; guard. [4 definitions]
defendable combined form of defend.
defendant one who is accused or sued in a court of law. (Cf. plaintiff.) [2 definitions]
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.