GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Semi- . [L. semi; akin to Gr. , Skr. sāmi-, AS. sām-, and prob. to E. same, from the division into two parts of the same size. Cf. Hemi-, Sandelend.] A prefix signifying half, and sometimes partly or imperfectly; as, semiannual, half yearly; semitransparent, imperfectly transparent.
   1913 Webster
   ☞ The prefix semi is joined to another word either with the hyphen or without it. In this book the hyphen is omitted except before a capital letter; as, semiacid, semiaquatic, semi-Arian, semiaxis, semicalcareous.
   1913 Webster