A truism is a claim that is so obvious or self-evident as to be hardly worth mentioning, except as a reminder or as a rhetorical or literary device, and is the opposite of falsism.[1]

In philosophy, a sentence which asserts incomplete truth conditions for a proposition may be regarded as a truism.[citation needed] An example of such a sentence would be "Under appropriate conditions, the sun rises." Without contextual support – a statement of what those appropriate conditions are – the sentence is true but incontestable.

Lapalissades, such as "If he were not dead, he would still be alive", are considered to be truisms.[citation needed]

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  1. ^ "Definition: truism". http://www.websters-online-dictionary.org/: Webster's Online Dictionary. Archived from the original on 2011-06-28. Retrieved 2010-03-10. An undoubted or self-evident truth; a statement which is pliantly true; a proposition needing no proof or argument; -- opposed to falsism. Websters.