High Quality Content by WIKIPEDIA articles! Pleonasm is the use of more words or word-parts than is necessary for clear expression: examples are black darkness, tuna fish, or burning fire. Such redundancy is, by traditional rhetorical criteria, a manifestation of tautology. The term is derived from a Greek word meaning I am redundant. The concept morpheme differs from the concept word, as many morphemes cannot stand as words on their own. A morpheme is free if it can stand alone, or bound if it is used exclusively alongside a free morpheme. Its actual phonetic representation is the morph, with the different morphs representing the same morpheme being grouped as its allomorphs.