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Originally used in common American/English vernacular as 'all intents and purposes' by just barely unintelligent people trying to sound as if the 'intents and purposes' surrounding them are highly important.

This phrase has since been changed to 'all intensive purposes' by people who do not listen carefully to the original phrase used in poorly written movies and who have also never seen it in print in equally poorly written books.

Also, the person listening to a speaker who says 'all intensive purposes' is likely to overlook it.
Tanar: Yeah, you're pretty much by best friend, but for all intensive purposes we'll just call it a tie between you and Kelsey.

Alyssa: Okay!
by FiskElection December 15, 2009
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What people say when they misheard "all intents and purposes". It means "all things considered."
For all intensive purposes, most smart people have something worthwhile to say.
by zilesaxet November 30, 2016
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