The dictionary does not give a word its meaning. Context gives a word meaning. Dictionaries only record what context has been used for a word. therefore irregardess and regardless while not fitting good etymology they mean the same thing. Just like flammable and inflammable mean the same thing in spite of etymology.
Just as someone observed earlier grammar and dictionary definitions do not dictate the rules, but the rules and definitions are based on what is observed.
When I use teach Koine Greek and Biblical Hebrew, I would use the word ball to show that the dictionary does not define a word but the context of a word gives it meaning. Did I mean a round object, did I mean a dance event, do I mean having a good time. Only context gives it meaning.
All of this gives rise to words changing their meaning. Take "merry" it use to have the usage as courageous. Hence, Robin Hood and his Merry Men was not because they were happy but courageous.
