This is the 8224th most frequent Japanese word.
帳
Notebook, account book, or register.
帳 here refers to a notebook or book used for a specific purpose, in this case, '日記帳' meaning a diary notebook.
彼女は日記帳に毎日日記を書く。
She writes a diary in her diary notebook every day.
帳 here is used as part of the word '帳簿', which means a ledger or account book for maintaining financial records.
経費はこの帳簿に記載されています。
Expenses are recorded in this ledger.
帳 is used here in '野帳', indicating a field notebook commonly used for taking notes during outdoor activities or research.