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

2. (n.) 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).

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

Bronze Age Dark Ages Depression Era Golden Age Ice Age Iron Age Jacksonian Age Middle Ages New Deal Era Prohibition Era Silver Age Steel Age Stone Age age days epoch glacial epoch stage term time