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Longman Dictionary of Contemporary English
book token
noun
EXAMPLES FROM CORPUS
▪ A £10 book token will be awarded to the sender of the first correct solution opened on Thursday 7 March.
WordNet
book token

n. a gift voucher that can be exchanged for books costing up to am amount given on the voucher

Wikipedia
Book token

A book token is a type of gift voucher redeemable in hundreds of participating bookshops as an alternative to cash.