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English definition of “tautology”

tautology

noun [C or U]     /tɔːˈtɒl.ə.dʒi/ US  /tɑːˈtɑː.lə-/
the unnecessary and usually unintentional use of two words to express one meaning Saying againSaying and uttering tautological     /ˌtɔː.təˈlɒdʒ.ɪ.kəl/ US  /ˌtɑː.t̬əˈlɑː.dʒɪ-/ adjective Saying againSaying and uttering tautologically     /ˌtɔː.təˈlɒdʒ.ɪ.kəl.i/ US  /ˌtɑː.t̬əˈlɑː.dʒɪ-/ adverb Saying againSaying and uttering
(Definition of tautology noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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