「辞書 (jisho)」 means "dictionary." It's a book or an app where you can look up the meanings of words. For instance, 「これは新しい辞書です。」 means "This is a new dictionary." It's very useful for studying!
「辞書(じしょ)」は「言葉の意味を調べる本」という意味です。勉強するときに使います。
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