(baseball) a measure of a pitcher's effectiveness; calculated as the average number of earned runs allowed by the pitcher for every nine innings pitched
a major division of geological time; an era is usually divided into two or more periods
a period marked by distinctive character or reckoned from a fixed point or event
Abbreviation for Engine Room Artificer - rank in Royal Navy
FIRST
ranking above all others; "was first in her class"; "the foremost figure among marine artists"; "the top graduate"
serving to begin; "the beginning canto of the poem"; "the first verse"
the fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate)
serving to set in motion; "the magazine's inaugural issue"; "the initiative phase in the negotiations"; "an initiatory step toward a treaty"; "his first (or maiden) speech in Congress"; "the liner's maiden voyage"
the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving
before anything else; "first we must consider the garter snake"
preceding all others in time or space or degree; "the first house on the right"; "the first day of spring"; "his first political race"; "her first baby"; "the first time"; "the first meetings of the new party"; "the first phase of