Eon vs. Era — What's the Difference?

An indefinitely long period of time; an age.

An era is a span of time defined for the purposes of chronology or historiography, as in the regnal eras in the history of a given monarchy, a calendar era used for a given calendar, or the geological eras defined for the history of Earth. Comparable terms are epoch, age, period, saeculum, aeon (Greek aion) and Sanskrit yuga.

The longest division of geologic time, containing two or more eras.

A period of time as reckoned from a specific date serving as the basis of its chronological system.

(US) Eternity.

A period of time characterized by particular circumstances, events, or personages

A period of 1,000,000,000 years.

The longest division of geologic time, made up of one or more periods.

(geology) The longest geochronologic unit, being a period of hundreds of millions of years; subdivided into eras.

A time period of indeterminate length, generally more than one year.

A long period of time.

(geology) A geochronologic unit of tens to hundreds of millions of years; a subdivision of an eon, and subdivided into periods.

A spirit being emanating from the Godhead.

A fixed point of time, usually an epoch, from which a series of years is reckoned.

An immeasurable or infinite space of time; eternity; a long space of time; an age.

A period of time reckoned from some particular date or epoch; a succession of years dating from some important event; as, the era of Alexander; the era of Christ, or the Christian era (see under Christian).

One of the embodiments of the divine attributes of the Eternal Being.

A period of time in which a new order of things prevails; a signal stage of history; an epoch.

The longest division of geological time

A period marked by distinctive character or reckoned from a fixed point or event

An immeasurably long period of time

A major division of geological time; an era is usually divided into two or more periods

(Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe