Pertaining to the game of baseball, ERA (Earned Run Average) is a statistical measure of the effectiveness of a pitcher. It is computed by the following formula:

ERA = (earned runs allowed)*(9)/(innings pitched)

Obviously, the lower the ERA, the more effective the pitcher, with an ERA of around 1.50 or below being considered excellent.
If Tim Hudson, starting pitcher for the Atlanta Braves, pitches 38 innings spread out over the first 6 games of the season, and allows 4 earned runs during those games, his ERA would be (4*9)/38 or 0.95. Thus he would be seen to be an extremely effective pitcher.
de Fox Horn 5 mai 2005
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An Age. A Spesific gap of time which ends due to a dramatic or extraordinery change.
Also a vely vely kewl nick. which is taken so :P on you.
The end of an Era.
de Era 21 mai 2003
A time before you did something you no longer do now.
Guy 1:hey john remember hanging out with them
Guy 2:yeah man I can't go back to that era.
de Thad castle 9 janvier 2014
Dick in Assyrian, frequently used by people from Fairfield.
Era look at that sick chick do you reckon she puts out cuz?
de massiv 9 juillet 2004
A mystical male with large eyes(;
Person A: look at this guy
Person B: He's an ERA
de themagicalfairy 12 décembre 2010
The really cute camgirl on 4chan, who posts in the /b/ section. She's very sweet and brings smiles to all /b/-tards with her cute pics. The most popular 4chan camgirl since cracky-chan.
era is so cute! I look at my pictures of her every day, wishing that one day, we could meet face to face.
de Hand Hanzo 1 avril 2005
funny Jewish girls who suffer from limited food freedom and rabbit fetish. They have a tendency to want to become a pokemon, usually the Jigglypuff.
Poor Erica, her grandmother tempted her with too much food again. Her bathroom became her room!

She's an ERA huh?
de DragonKnightAcer 18 novembre 2010

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