A gazillion is a made-up word people use when they want to describe an enormous, almost unimaginable number. When your mom says “I've told you a gazillion times to clean your room,” she doesn't mean exactly one gazillion times (that number doesn't actually exist!). She means she's told you so many times that she's lost count and feels exhausted from repeating herself.

You might say there are a gazillion stars in the sky, a gazillion grains of sand on a beach, or a gazillion reasons why you should get a puppy. The word works because it sounds like real number words such as million, billion, and trillion, but it's playful and exaggerated. When you use gazillion, you're essentially saying “way more than I could ever count” in a fun, emphatic way.

Similar invented words include bajillion, jillion, and zillion. None of these appear in math textbooks because they aren't real numbers. They're expressive tools that let you communicate “an incredibly huge amount” without getting bogged down in actual counting. Just remember: if you're doing math homework and write “gazillion” as your answer, your teacher won't be impressed, no matter how big the actual number is!