内容証明郵便 ないようしょうめいゆうびん Meanings Noun contents-certified mail Kanji 内 inside. Read as ナイ. 容 contain. Read as ヨウ. 証 proof. Read as ショウ. 明 clear. Read as メイ. 郵 mail. Read as ユウ. 便 mail. Read as ビン. Jinuma: Japanese Dictionary · Word lists