Geologic time refers to the vast expanse of time in which Earth has evolved and changed. However, there are several synonyms that can be used to describe this period. For instance, Paleozoic Era, Mesozoic Era, and Cenozoic Era all refer to specific eras within geologic time. Alternatively, terms such as prehistoric era, ancient eon, and deep time can also be used to describe this period. Additionally, the terms geological age and geochronology can be used to imply a more scientific context, while Earth's history and planetary evolution are more general terms that still convey the same meaning. Ultimately, no matter which term is used, they all describe the incredible expanse of time since the formation of our planet.