noun
circular letter; circulating document
Refers to a document or letter circulated among a group, often for official or organizational communication.
町内会の回文で来月の清掃当番が知らされた。
The neighborhood association's circular letter informed us of next month's cleaning duty.
会社から全社員に回文が回ってきた。
A circular was circulated to all employees from the company.
noun
palindrome
A word, phrase, or sequence that reads the same forwards and backwards, e.g., しんぶんし (新聞紙).
「たけやぶやけた」は有名な回文です。
"Takeyabu yaketa" (the bamboo grove burned) is a famous palindrome.
From 回 (kai, 'circulate') + 文 (bun, 'writing'). The palindrome sense likely derives from the idea of a sentence that 'circulates' back to its start.