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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.)
by Bob Stein October 23, 2008
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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
by jengajam24 March 10, 2010
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Related Words

theology

the study of god(s) and other religious topics.
vincent van gogh was going to be a minister, but refused to learn latin and theology.
by gunslingergirlvy_c_e April 11, 2006
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theology

The supporting rationale, doctrine, beliefs, tenets and written word that backs up and confirms what the voices in your head are telling you.
Leon didn't have any formal training in theology and figured he didn't need any, as God spoke to him and him alone and God was telling him that the big chested blonde girl in the second pew needed some laying on of the hands.
by harry flashman July 18, 2003
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Necro-Tautology

1) An obsessive facination with deceased tortoises.

2) An erotic attraction to or the need to copulate with deceased tortoises.

Etymology:

Normally enjoyed by the lesser active and unfit of the human species, due to the fact that a dead tortoise will not say no or crawl away and thus irradicates the fear of rejection.
1) Look a dead tortoise--lets partake in the act of Necro-Tautology!
- You sick fuck, leave it alone

2) People have said that I am a tortaulogist.
- Dude you hump tortoises?
by Grey M@a September 10, 2004
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Trélogy

Another name for Green Day's trilogy albums (¡UNO!, ¡DOS!, & ¡TRÉ!).
Green Day's trélogy albums are so underrated!
by blinkinday June 6, 2017
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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.
by BNENJK September 26, 2012
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