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The word 'Cambrian' is typically used to describe a geological time period that occurred about 500 million years ago. This period is often referred to as the 'Cambrian period' and is known for the explosion of complex life forms that appeared during this time. The word 'Cambrian' can also be used to describe certain types of fossils or rock formations that are associated with this time period. In everyday conversation, the word 'Cambrian' may not come up often, but it is a useful term to know if you are studying geology or the history of life on Earth.