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

 

tautology

 noun
noun
BrE BrE//tɔːˈtɒlədʒi//
 
; NAmE NAmE//tɔːˈtɑːlədʒi//
 
[uncountable, countable] Linguistic devices
 
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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.’ See related entries: Linguistic devices Word Origin mid 16th cent.: via late Latin from Greek, from tautologos ‘repeating what has been said’, from tauto- ‘same’ + -logos (see -logy).
See the Oxford Advanced American Dictionary entry: tautology