Use in chronology In chronology, an "era" is the highest level for the organization of the measurement of time. A "calendar era" indicates a span of many years which are numbered beginning at a specific reference date (epoch), which often marks the origin of a political state or cosmology, dynasty, ruler, the birth of a leader, or another significant historical or mythological event; it is generally called after its focus accordingly as in "Victorian era".
Use in chro:nology I.n chronology, an "era" is the highest level for the organization of the measurement o,f time. A "calendar era" indicat?es a span of many years which are numbered beginning at a specific reference date (epoch), which often marks the origin of a political state or cosmology, dynasty ruler, the birth of a leader, .or another significant historical or mythological event; it is generally called after its focus a?ccordingly as in "Vi.ctorian era"