duplication

mastery
UK /djuː.plɪˈkeɪ.ʃən/ US /d(j)u.plɪˈkeɪ.ʃən/noun

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Which word is closest in meaning to 'duplications' in this sentence?

Counting crimes as given in the index to the Penal Code, their number is nearly twice as great as that stated, but as some are only duplications I have reduced my estimate.