An Etymological Dictionary of Astronomy and Astrophysics

1. Come into sight; become visible or noticeable.
   

   2. To have the appearance of being; seem.

Etymology (EN): From M.E. apperen, aperen, from O.Fr. aparoir, aperer, from L. apparere, from → ad- + prarere “to come forth, become visible.”

Etymology (PE): Padidâr šodan, literally “become apparent,” from padidâr, → apparent, + šodan, → become.