ERA

ERA (countable and uncountable, plural ERAs)

(astrometry) Initialism of Earth rotation angle (the rotation of the Earth from the Celestial Intermediate Origin that has no instantaneous motion along the equator.)
(baseball) Initialism of earned run average, a baseball statistic.
- 2025 June 11, “White Sox pitching prospect Grant Taylor makes jump from Double-A to perfect major league debut”, in Associated Press‎, archived from the original on 12 June 2025:
  Taylor, listed at 6-foot-3 and 230 pounds, went 0-1 with a 1.01 ERA in 15 games for Birmingham. He struck out 37 in 26 2/3 innings.
(electronics) Initialism of electrically reconfigurable array.
(military) Initialism of explosive reactive armor.
(UK, military) Initialism of engine room artificer, a Royal Navy position.

ERA

(European Union, railways) Initialism of European Railway Agency, called today the European Union Agency for Railways.
(US politics) Initialism of Equal Rights Amendment, a proposed amendment to the US Constitution.
- 1983, Catharine A. MacKinnon, “Excerpts from MacKinnon/Schlafly Debate”, in Minnesota Journal of Law & Inequality‎, volume 1, number 2:
  ERA meant the equality of women, to those who urgently sought it, to those who abhorred it, and to those who found it obvious if not entirely redundant.
- 2019 September 30, Gerard N. Magliocca, “BURIED ALIVE: THE REBOOT OF THE EQUAL RIGHTS AMENDMENT”, in RUTGERS UNIVERSITY LAW REVIEW‎, volume 71, archived from the original on 6 October 2025, page 634:
  This Article argues that Congress can recognize the ERA as part of the Constitution despite the expiration of the ratification deadline in 1982. But Congress should not do so until there is no doubt that thirty-eight states have ratified the ERA.

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