means a person who lives near you, especially in an adjacent or nearby home.

from From Old English nēahgebūr, a tidy compound of nēah, "near" (the same root that gives us "nigh"), and gebūr, "dweller" or "farmer" — so a neighbor was literally a "near-dweller." That gebūr is a cousin of "boor" (originally just a peasant or rustic, before it soured into rudeness) and survives in "husband" via "bondi." The word came up the Germanic line; Dutch keeps it nearly intact as buur, and German as Nachbar.