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4.
Era
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.
ayon kay Fox Horn ika-05 ng Mayo, 2005
 
1.
Era
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.
ayon kay Era ika-21 ng Mayo, 2003
 
2.
Era
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.
ayon kay Thad castle ika-09 ng Enero, 2014
 
3.
ERA
A mystical male with large eyes(;
Person A: look at this guy
Person B: He's an ERA
ayon kay themagicalfairy ika-12 ng Disyembre, 2010
 
5.
Era
Dick in Assyrian, frequently used by people from Fairfield.
Era look at that sick chick do you reckon she puts out cuz?
ayon kay massiv ika-09 ng Hulyo, 2004
 
6.
Era
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.
ayon kay Say it like it is... ika-01 ng Hunyo, 2011
 
7.
ERA
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?
ayon kay DragonKnightAcer ika-18 ng Nobyembre, 2010