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Default \De*fault"\, v. i. [imp. & p. p. {Defaulted}; p. pr. & vb. n. {Defaulting}.] 1. To fail in duty; to offend. That he gainst courtesy so foully did default. --Spenser. 2. To fail in fulfilling a contract, agreement, or duty. 3. To fail to appear in court; to let a case go by default.