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Definition of tautology noun from the Oxford Advanced Learner's Dictionary

tautology

noun
 
/tɔːˈtɒlədʒi/
 
/tɔːˈtɑːlədʒi/
[uncountable, countable]
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  1. a statement in which you say the same thing twice in different words, when this is unnecessary, for example ‘They spoke in turn, one after the other.’Topics Languagec2
    Word Originmid 16th cent.: via late Latin from Greek, from tautologos ‘repeating what has been said’, from tauto- ‘same’ + -logos (see -logy).
See tautology in the Oxford Advanced American Dictionary
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