1A book or database used to look up the meanings, readings, and usages of words.
分からない言葉があったら、辞書で調べてください。
If there's a word you don't understand, please look it up in a dictionary.
スマホの辞書アプリはとても便利だ。
Dictionary apps on smartphones are very convenient.
新しい辞書を買って、古い言葉遣いも学びたい。
I want to buy a new dictionary and learn old-fashioned expressions too.
英和辞書を使って英語のニュースを読んだ。
I read English news using an English-Japanese dictionary.
2An archaic usage referring to a letter of resignation (now expressed as 辞表); rarely used today.