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century one of the hundred-year periods into which human history is divided. Centuries are usually counted forward or backward from the beginning of the Christian era. [1/2 definitions]
era a period of time in history. An era often begins or ends with an important event.
Paleozoic of, relating to, or belonging to the era in the earth's history from about 540 million years ago to about 250 million years ago. During this time, the first fishes, amphibians, reptiles, insects, and land plants appeared.