The Collaborative International Dictionary of English v.0.48:
Establishment \Es*tab"lish*ment\, n. [Cf. OF. establissement, F.
1. The act of establishing; a ratifying or ordaining;
2. The state of being established, founded, and the like;
3. That which is established; as:
(a) A form of government, civil or ecclesiastical;
especially, a system of religion maintained by the
civil power; as, the Episcopal establishment of
(b) A permanent civil, military, or commercial, force or
(c) The place in which one is permanently fixed for
residence or business; residence, including grounds,
furniture, equipage, etc.; with which one is fitted
out; also, any office or place of business, with its
fixtures; that which serves for the carrying on of a
business; as, to keep up a large establishment; a
Exposing the shabby parts of the establishment.
Establishment of the port (Hydrography), a datum on which
the tides are computed at the given port, obtained by
observation, viz., the interval between the moon's passage
over the meridian and the time of high water at the port,
on the days of new and full moon.