Webster
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Webster’s Revised Unabridged Dictionary · 1913

Semi-

Sem′i- (sĕm′ĭ·). [L. semi; akin to Gr. ἡμι, 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.

☞ 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.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article.