According to the 8th Edition of the Oxford Advanced Learner's Dictionary, youth means young people considered as a group. The same dictionary defines inclusion as the action or state of including or
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Oxford advanced learner's dictionary of current English (1974 edition) | Open Library
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Oxford Advanced Learner's Dictionary of Current English: Hornby, A.S., Hornby, A.S., Wehmeier, Sally: 9780194315647: Amazon.com: Books
Oxford Advanced Learner's Dictionary, 8th Edition International Student's Edition with CD-ROM and Oxford iWriter (only available in certain markets): 9780194799140: Amazon.com: Books