Emily Dickinson Lexicon

TAU-TOL'O-GY, n. [Gr. ταυτολογια; ταυτος, the same, and λογος, word or expression.]

A repetition of the same meaning in different words; needless repetition of a thing in different words or phrases; or a representation of any thing as the cause, condition or consequence of itself, as in the following lines. Cyc. The dawn is overcast, the morning low'rs, / And heavily in clouds brings on the day. Addison.