[email protected]/23/03 6:36 PM

Usage Note: Irregardless is a word that many mistakenly believe to be
correct usage in formal style, when in fact it is used chiefly in
nonstandard speech or casual writing. Coined in the United States in the
early 20th century, it has met with a blizzard of condemnation for being an
improper yoking of irrespective and regardless and for the logical absurdity
of combining the negative ir- prefix and -less suffix in a single term.
Although one might reasonably argue that it is no different from words with
redundant affixes like debone and unravel, it has been considered a blunder
for decades and will probably continue to be so.

Source: The American Heritage® Dictionary of the English Language, Fourth
Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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And this is the CS list, NOT the OT list.
Please take note.

Jack