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tautology 

True by definition, literally "saying the same". Pointlessly obvious. Additional words that add no meaning.
"Either we'll get in trouble, or we won't" is a logical tautology. By including all possibilities the statement must inherently be true.

In "PIN number" the word "number" is a tautology because a PIN is always a number. (At least that's what the N originally stood for — if the term PIN evolved to include letters someday then PIN number would no longer be a tautology.)

In "morning sunrise" the tautology is "morning" because sunrises are a subset of mornings; removing the first word removes no meaning. (The addition of "morning" may be aesthetically more pleasing, in a poem for example, but it remains a logical tautology.)
tautology by Bob Stein October 23, 2008

tautology 

Tautology (n): that which is tautologous, a tautology.
Jack built a brick house out of bricks.
The filing cabinet had inertia, it wouldn't budge.
Go sit in the corner where the walls and floor meet, boy!
The tautologous tautology
tautology by jengajam24 March 10, 2010

Tautology 

Using different words to say the same thing, or a series of self-reinforcing statements that cannot be disproved because they depend on the assumption that they are already correct
ME: Dudes such a wanker he’s dead-to-me… like piss-on-his-grave dead-to-me…
FRIEND: Thats a hell-of-a tautology if i have ever heard one.
Tautology by BNENJK September 26, 2012

Tautology 

The repetition of meaning in the same sentence, using different words. Usually decreases clarity of speech/writing.
Example of a sentence using Tautology:
He struggled to lift the heavy weights, he had trouble raising them.
Tautology by Chaye June 25, 2009

tautology 

A synchrony in which formalism and representation are continuous ie. "is-is-is" collapses to 'is' or the "ohm."

A continuity of being and having.

A frame in which self-cyclicality achieves linearity (continuity) and value IS meta-value and meta-value is value rendering the semantics of "state" untenable.
In a tautology "is" is 'is' (and 'is' is "is").
tautology by sandraxine August 7, 2018

tautology 

A tautology is a thing which is tautological.
A tautological tautology.
tautology by unixclan.net August 10, 2006