ଅର୍ଥ : (logic) a statement that is necessarily true.
ଉଦାହରଣ :
The statement `he is brave or he is not brave' is a tautology.
ଅର୍ଥ : Useless repetition.
ଉଦାହରଣ :
To say that something is `adequate enough' is a tautology.