- in Biology , the failure of an Organism to develop properly (see Congenital Disorder ).
- in Manufacturing , the failure of a product to conform to specification.
- in Materials Science , a Crystallographic Defect is a structural imperfection in a crystal.
- in Software Engineering , the non-conformance of software to its Requirement s. A Bug , defect, error, are all examples of failures.
- to abandon allegiance to one's country and go to another.
- in Geometry , the amount by which the sum of the angles at a vertex of a Polyhedron falls short of a complete circle. If the sum of the angles exceeds a full circle, then the defect is negative. See Defect (geometry) .
- in Politics and/or a Military context, the verb ''to defect'' refers to switching sides (see Defector ).
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