An Etymological Dictionary of Astronomy and Astrophysics

1. The act or the action of representing; the state of being represented.
   

2. The expression by some term, character, symbol, or the like.

Etymology (EN): M.E. representacion, from L. repraesentation, from repraesentatus p.p. of repraesentare, from → re- + praesentare “to show, give, present for approval,” from praesens, from praeesse “to be before others, to be present,” from prae- “before,”
→ pre- + esse “to be,” cognate with Pers. ast “is,” astan, hastan “to be.”

Etymology (PE): Nemâyeš, nemâyandegi, from nemudan “to show, demonstrate, exhibit,” → display