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Era
An era is a span of time marked by character, events, changes on earth, etc. When used in science, for example geology, an ''era'' denotes a clearly defined period of time of arbitrary but well-defined length, such as for example the Mesozoic Era from 252 Ma–66 Ma, delimited by a start event and an end event. When used in social history, eras may for example denote a period of some monarch's reign. In colloquial language, eras denote longer spans of time, before and after which the practices or fashions change to a significant degree. When era is extended to a calendar system, it is known as a calendar era. In Sanskrit or Indian culture eras are known as Yugas.
==Uses==
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''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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