Words are so wonderful. We use them all day long, and everybody knows what they mean. What always surprises me, though, is when you really try to sit down and describe what a word is, it's incredibly difficult. For example: cat. We all know what at cat is. But how to explain it? A short furry animal that—uh—will scratch the freckles off your face if you attempt give it the pill prescribed by the vet?

This is why the dictionary is such a glorious invention—its ability to precisely explain the complexities of our seemingly simple language. And as of yesterday, one of our favorite phrases, "Aha Moment," has made it into Merriam-Webster's Collegiate version, where it's described not just as a noun but  as "a moment of sudden realization, inspiration, insight, recognition, or comprehension."

USA Today spoke with the Merriam-Webster's associate editor, Korry Stamper and found out that   "aha moment" was first introduced into the lexicon almost 75 years ago and was cited in a 1939 psychology textbook. But we know who brought it into our lives:

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Now when are they going to put bing-bing-bing-bing in the dictionary?

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