In grammar, a tautology (from Greek tauto, "the same" and logos, "word"/"idea") is an unnecessary repetition of meaning, using more than one word effectively to say the same thing (often originally from different languages). It is considered a fault of style and was defined by A Dictionary of Modern English Usage (Fowler) as "saying the same thing twice", when it is not apparently necessary to repeat the entire meaning of a phrase. "Fatal murder" is an example of a tautology. If a part of the meaning is repeated in such a way that it appears as unintentional, or clumsy, then it may be described as tautological. On the other hand, a repetition of meaning that improves the style of a piece of speech or writing is not necessarily tautological.