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1.
A undoubted or self-evident truth.
When you look at the Sun it is bright.
by micb July 06, 2003
 
2.
stating the obvious, or being captain obvious. Truisms do not increase understanding, they only enforce stupidity.
Examples of Truism

uneducated nigger.
cheap jew.
smelly arab.
drunk indian.
by Dr. Franklin Jenkins Smitty February 02, 2010