Noun
A repetition of the same meaning in different words; needless repetition of an idea in different words or phrases; a representation of anything as the cause, condition, or consequence of itself, as in the following lines: --//The dawn is overcast, the morning lowers,/And heavily in clouds brings on the day. Addison.
Source: Webster's dictionaryTo create man was a quaint and original idea, but to add the sheep was tautology. Mark Twain
In his opinion, neither justice nor mercy were very closely related to love, let alone being identical with it-otherwise, why have three words instead of one? A metaphor is not a tautology. James Blish
Once the last trace of emotion has been eradicated, nothing remains of thought but absolute tautology. Theodor Adorno
Being both entrepreneurial and social is no longer an oxymoron, but rather a tautology. Jeremy Rifkin
A good poem is a tautology. It expands one word by adding a number which clarify it, thus making a new word which has never before been spoken. The seed-word is always so ordinary that hardly anyone perceives it. Classical odes grow from and or because, romantic lyrics from but or if. Alasdair Gray
All journalism is investigative to a greater or lesser extent, but investigative journalism – though it is a bit of a tautology – is that because it requires more, it's where the investigative element is more pronounced. Alan Rusbridger