noun🔗ShareA time period of indeterminate length, generally more than one year."Several eras of my family's history are documented in old photo albums. "timeperiodhistoryageChat with AIVocabulary GamePractice Reading
noun🔗ShareA unit of time, smaller than eons and greater than periods."The Mesozoic and Cenozoic are two of the most well-known eras in the history of Earth. "timehistorygeologyageChat with AIVocabulary GamePractice Reading
