"Irregardless" means the same as "regardless" - just like "literally" now means the same as "figuratively."So, if it exists as a word, what does it mean? It can't mean "regardless", because it doesn't make sense - "irregardless" should mean the opposite of "regardless", just as "irrespective" is the opposite of "respective" or "irresponsible" is the opposite of "responsible"! So, it should mean... regarding? With regard to?![]()
Or like inflammable means the opposite of flammable...oh, wait.
English as a language is determined by how it is used. Word meaning is determined by how it comes to be used in conversation as acceptable English. Irregardless has been used for over 150 years as a word in print so it should be accepted as common usage.
One of the reasons the OED is such a great dictionary is because it is a biography of the English language. Words become included based on their use in English not based on whether somebody says a word should be or not be.