The cumulative book income plus any gain or loss on disposition of assets. Bloomberg Financial Dictionary
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book profit UK US noun [C or U] (also book gain) ACCOUNTING
► profit that has been made but that has not yet been taken, for example when shares have risen in value since they were bought but have not yet been sold: »
If the land was revalued and stated in the balance sheet at its current market price, this would result in the company making a book profit.
Financial and business terms. 2012.