[ex.tra] adj [prob. short for extraordinary] (1776) 1 a: more than is due, usual, or necessary: additional "~ work" b: subject to an additional charge "room service is ~"
2: superior "~ quality"
[2]extra n (1793) 1: one that is extra or additional: as a: a special edition of a newspaper b: an added charge c: an additional worker; specif: one hired to act in a group scene in a motion picture or stage production
2: something of superior quality or grade [3]extra adv (1823): beyond the usual size, extent, or degree "~ large"