1413, from O.Fr. separation,
from L. separationem,
n. of action from separare
). Specific sense of "sundering of a married couple" is attested from 1600. Separation of powers
first recorded 1788, in "Federalist" (Hamilton), from Fr. séparée de la puissance
(Montesquieu, 1748). Separation anxiety
first attested 1943.