"lettered" in the verb sense
1. letter
win an athletic letter
2. letter
set down or print with letters
3. letter
mark letters on or mark with letters
"lettered" in the adjective sense
1. knowing, knowledgeable, learned, lettered, well-educated, well-read
highly educated having extensive information or understanding
"knowing instructors"
"a knowledgeable critic"
"a knowledgeable audience"
Source: WordNet® (An amazing lexical database of English)
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