era
UK: ˈɪərə | US: ˈɛrə
n. a long and distinct period of history marked by particular events, characteristics, or developments
n. (Geology) a major division of geological time, subdivided into periods
The word "era" originates from Late Latin aera, meaning "counters for calculation" or "epochs," derived from the plural of aes (copper, money). It evolved to denote fixed points in time (e.g., the start of a calendar system) and later generalized to mean any significant historical period. The term reflects the ancient practice of marking time by monetary or numerical systems, eventually broadening to describe cultural or geological spans.
The Industrial Revolution marked the beginning of a new era in human history.
Dinosaurs dominated the Jurassic era.
The digital era has transformed global communication.
Her leadership ushered in an era of prosperity.
Geologists study rock layers to identify different eras.