An Etymological Dictionary of Astronomy and Astrophysics

1. General: An expanse of anything.
   

2. Physics: A region or space defined by the presence of a physical force, such as electric, magnetic, or gravitational.
   

3. Math.: A mathematical entity for which addition, subtraction, multiplication, and division are well-defined.

Etymology (EN): M.E., from O.E. feld “plain, open land,” probably related to O.E. folde “earth, land,” from P.Gmc. *felthuz “flat land” (cf. Ger. Feld), from PIE *pel(e)-tu-,from base *pele- “flat, to sprea;” cf. L. planus “flat, level,” → plane.

Etymology (PE): Meydân “field, arena, extensive plain; town square; gathering place” from Mid.Pers. mêdân “arena, field.” Meydân has been borrowed into various languages: Ar. maydân, Turkish meydan, Crimean Tatar, Ukrainian maidan, Polish maidan, also in Pakistan, India, Indonesia, Nepal.