Definition of bookcrossing noun from the Oxford Advanced American Dictionary

 

bookcrossing

 noun
noun
NAmE//ˈbʊkˌkrɔsɪŋ//
 
[uncountable]
 
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the practice of leaving a book in a public place so that another person can find it, read it, and then leave it where someone else will find it The book had a label in it saying it was from bookcrossing. A friend introduced me to the idea of bookcrossing.
See the Oxford Advanced Learner's Dictionary entry: bookcrossing