Establishment /(?)/

Es·tab·lish·ment

Establishment

n.
  1. The act of establishing; a ratifying or ordaining; settlement; confirmation.
  2. The state of being established, founded, and the like; fixed state.
  3. That which is established;
    Exposing the shabby parts of the establishment.

Phrases & Compounds
Establishment of the port
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.