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a mathematical group whose elements are permutations and in which the product of two permutations is the same permutation as is obtained by performing them in succession.


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    [pur-kee] /ˈpɜr ki/ adjective, perkier, perkiest. 1. jaunty; cheerful; brisk; pert. /ˈpɜːkɪ/ adjective perkier, perkiest 1. jaunty; lively 2. confident; spirited adj. 1820, from perk (v.) + -y (2). Of young women’s breasts since at least 1937. Related: Perkily; perkiness. adjective Energetic and jaunty; lively; chipper (1855+)

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  • Pernicious

    [per-nish-uh s] /pərˈnɪʃ əs/ adjective 1. causing insidious harm or ruin; ruinous; injurious; hurtful: pernicious teachings; a pernicious lie. 2. deadly; fatal: a pernicious disease. 3. Obsolete. evil; wicked. /pəˈnɪʃəs/ adjective 1. wicked or malicious: pernicious lies 2. causing grave harm; deadly adj. early 15c., from Middle French pernicios (13c., Modern French pernicieux) and directly […]

  • Pernicious-anemia

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