tauto-, taut- +

Expressing the same thing with different words; opposed to allegorical.

Apparently a misspelling of tautochrone.

Apparently a misspelling of tautochronism.

That curve upon which a particle moving under the action of gravity (or any given force) will reach the lowest (or some fixed) point in the same time, from whatever point it starts.

A tautochrone or isochrone curve is the curve for which the time taken by a frictionless particle sliding down it under uniform gravity to its lowest point is independent of its starting point. The curve is a cycloid, and the time is equal to π times the square root of the radius over the acceleration of gravity.

Occupying the same time; pertaining to, or having the properties of, a tautochrone.

Having the character of a tautochrone; occupying the same time, isochronous.

The repetition of the same idea in different words, but (often) in a way that is wearisome or unnecessary. This should not be confused with the logical notion of tautology.

Repetition of the same sense in different words.

A reference to, characterized by, involving, or using tautology; that is, repeating the same word, or the same notion in different words.

1. The use of tautology.
2. A tautology.

Someone who uses tautological words or phrases.

1. To repeat the same thing in the same or with different words.
2. Using tautology.

1. Repeating the same thing in different words; tautological.
2. Involving or containing rhetorical tautology; redundant.
3. True by virtue of its logical form alone.

1. The needless repetition of an idea; especially, in words other than those of the immediate context, without imparting additional force or clearness, as in “widow woman”.
2. The redundant repetition of a meaning in a sentence, using different words.
3. In rhetoric, a tautology is the use of redundant language in speech or writing, or, put simply, "saying the same thing twice".
4. In logic: a compound propositional form all of whose instances are true, as “A or not A”; a proposition or statement that, in itself, is logically true; as, "Today, that competing swimmer will win or will not win."

A reference to the same menstrual period.