Yours, Etc.: Origins and Uses of 8 Sign-Offs
"neighboring," 1590s (implied in proximately), from Late Latin proximatus, past participle of proximare "to draw near," from proximus "nearest, next" (see proximity).
proximate prox·i·mate (prŏk'sə-mĭt)adj. Closely related in space, time, or order; very near; proximal.