Definition - adj [Old French deu, past participle of devoir to owe, from Latin debere] 1 a: satisfying or capable of satisfying an obligation, duty, or requirement under the law <the buyer's ~ performance under the contract> <~ proof of loss> b: proper under the law <obstructing ~ administration of justice> 2: capable of being attributed used with to <any loss ~ to neglect> 3 a: having reached the date at which payment is required : See also payable b: owed though not yet required to be paid 4: See also reasonable