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Definition of R: R, the eighteenth letter of the English alphabet, is a vocal consonant. It is sometimes called a semivowel, and a liquid. See Guide to Pronunciation, 178, 179, and 250-254.

Synonyms:

PG-13, ABC's, Defender of the Faith, boundary, contour, cartography, apt., e, c, f, a, 15, rate, 2, 8, NC-17, atlas, Capt., globe, universal gas constant, acronym, AV, 4, bcc, d, CCTV, 18, aitch, 12, ma'am, b, radius, FWIW, grid, BTW, grid reference, cf., the Queen, the Prince of Wales, Rep., PG, chart, h, Rex, republican, bpi, roentgen, 1, Regina, g, the Republican Party, the GOP, cc, abbreviation, coordinate, anon., rating, H.R.H., gas constant, sire, the Queen Mother