Real Dictionary

tautology
variable noun: Tautology is the use of different words to say the same thing twice in the same statement. 'The money should be adequate enough' is an example of tautology.

tautology in American English
needless repetition of an idea in a different word, phrase, or sentence; redundancy; pleonasm (Ex.: “ necessary essentials”)
noun: needless repetition of an idea, esp. in words other than those of the immediate context, without imparting additional force or clearness, as in “ widow woman”

tautology in British English
noun: the use of words that merely repeat elements of the meaning already conveyed, as in the sentence Will these supplies be adequate enough? in place of Will these supplies be adequate?