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digamma (n.)
Related entries & more 1550s, "the letter F;" 1690s as the name of a former letter in the Greek alphabet, corresponding to -F- (apparently originally pronounced with the force of English consonantal -w-), from Latin digamma "F," from Greek digamma, literally "double gamma" (because it resembles two gammas, one atop the other). The sixth letter of the original Greek alphabet, it corresponded to Semitic waw.
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eta (n.)Greek letter, originally the name of the aspirate, from Phoenician heth.
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lambda (n.)Greek letter name, from a Semitic source akin to Hebrew lamedh.
Related entries & more zee (n.)"the letter Z," 1670s, now more common in American English.
Related entries & more brevet (n.)mid-14c., from Old French brievet "letter, note, piece of paper; papal indulgence" (13c.), diminutive of bref "letter, note" (see brief (n.)). Military sense of "a commission to a higher rank without advance in command" (for meritorious service, etc.) is from 1680s.
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