Webster
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Webster’s Revised Unabridged Dictionary · 1913

Complementary

Com′ple·men′ta·ry, a. Serving to fill out or to complete; as, complementary numbers.

Complementary colors. See under Color. — Complementary angles (Math.), two angles whose sum is 90°.

Com′ple·men′ta·ry, n. [See Complimentary.] One skilled in compliments. [Obs.] B. Jonson.

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; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.