Definition of "irregardless" [irregardless]

• Nonstandard Regardless. (adverb)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• ""It's right up there with people who use the term 'irregardless.'""
• "Since you are so quick to pick out someone elses failings, try looking in the mirror ... "irregardless" is not an acceptable word to use in the context you applied it ..."
• "The question isn’t whether or not irregardless is a word, because that’s such an ill-defined question."