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单词	sigma
释义	sig·ma (sĭgmə) n. 1. The 18th letter of the Greek alphabet. See Table at alphabet. 2. A sigma factor. 3. Statistics The standard deviation of a given probability distribution or a given set of data. [Greek sīgma, of Phoenician origin; see smk in the Appendix of Semitic roots.] sigmate′ (-māt′) adj.
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英语词典包含135693条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。