An Etymological Dictionary of Astronomy and Astrophysics

1. The area or region around or near some place or thing; vicinity. → solar neighborhood.
   

2. Math.: An → open set that contains a given point.

Etymology (EN): From neighbor, M.E., O.E. neahgebur, from neah→ near + -hood suffix denoting “state or condition of being;” M.E. -hode, -hod;
O.E. -had “condition, position,” cognate with Ger. -heit, Du. -heid.

Etymology (PE): Hamsâyegi, noun from hamsâyé “neighbor,” literally “under, sharing the same shade,” from ham-, → syn-, + sâyé,
→ shadow.