"remoteness," 1540s, from Latin longinquitas "length, extent, duration," from longinquus "long, extensive, remote, distant," from longus "long; distant, remote" (see long (adj.)) + suffix -inquus.
long-haul
long-headed
longhorn
longi-
longing
longinquity
longish
longitude
longitudinal
long-lived
long-neck