Definition of tautologous adjective from the Oxford Advanced Learner's Dictionary

 

tautologous

 adjective
adjective
BrE BrE//tɔːˈtɒləɡəs//
 
; NAmE NAmE//tɔːˈtɑːləɡəs//
 
 
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(of a statement, etc.) saying the same thing twice in different words, when this is unnecessary, for example ‘They spoke in turn, one after the other.’ synonym tautological