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accordance of reality and its representation; state or condition of being complete; state in which nothing needs to be added From Wikiquote, the free quote compendium
Completeness is the property of being whole, entire. In general, an object is complete if nothing needs to be added to it. This notion is made more specific in various fields. In logic, semantic completeness is the converse of soundness for formal systems. A formal system is "semantically complete" when all its tautologies are theorems, whereas a formal system is "sound" when all theorems are tautologies (that is, they are semantically valid formulas: formulas that are true under every interpretation of the language of the system that is consistent with the rules of the system). In Computational complexity theory a computational problem is complete for a complexity class if it is, in a technical sense, among the "hardest" (or "most expressive") problems in the complexity class.
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