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tri-letter
tri-letter adj. 
/ˈtrʌɪlɛtə/, /ˈtraɪˌlɛdər/
Brit. /(ˌ)trʌɪˈlɛtə/
, /(ˌ)trʌɪˈlɛtə//ˈtrʌɪlɛtə/U.S. /ˌtraɪˈlɛdər/
, /ˌtraɪˈlɛdər//ˈtraɪˌlɛdər/ΚΠ
1902 Westm. Gaz. 6 Aug. 6/1 A new telegraphic code has been invented..known as Baldrey's Tri-Letter Code... Every word in any language is represented by three letters only.
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