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.
作者 Fox Horn 2005年5月05日
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.
作者 Era 2003年5月21日
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.
作者 Thad castle 2014年1月09日
A mystical male with large eyes(;
Person A: look at this guy
Person B: He's an ERA
作者 themagicalfairy 2010年12月12日
Dick in Assyrian, frequently used by people from Fairfield.
Era look at that sick chick do you reckon she puts out cuz?
作者 massiv 2004年7月09日
Era or "Error": A white rapper with no talent, who over-zealously proclaims their greatness, and takes credit for their older brother's accomplishments.
Era was on stage in Tiffin, Ohio, pretending to be a hard-core rapper in front of a sea of white people. Pretty hard-core.
作者 Say it like it is... 2011年6月01日
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?
作者 DragonKnightAcer 2010年11月18日

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