Definition of tautology noun from the Oxford Advanced American Dictionary

 

tautology

 noun
noun
NAmE//tɔˈtɑlədʒi//
 
[uncountable, countable]
 
jump to other results
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.”
tautological
 
jump to other results
NAmE//ˌtɔt̮lˈɑdʒɪkl//
 
adjective
tautologous
 
jump to other results
NAmE//tɔˈtɑləɡəs//
 
adjective
See the Oxford Advanced Learner's Dictionary entry: tautology