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1650s, "want of symmetry or proportion," from Greek asymmetria, noun of quality from asymmetros "having no common measure; disproportionate, unsymmetrical," from a- "not" + symmetros "commensurable" (see symmetry).
asymmetry a·sym·me·try (ā-sĭm'ĭ-trē)
Disproportion between two or more like parts; lack of symmetry.