Departure

noun

1. The act of departing or something that has departed.

   "The departure was scheduled for noon."

2. A deviation from a plan or procedure.

   "There are several significant departures, however, from current practice."

3. A death.
4. The distance due east or west made by a ship in its course reckoned in plane sailing as the product of the distance sailed and the sine of the angle made by the course with the meridian.
5. The difference in easting between the two ends of a line or curve.

   "The area is computed by latitudes and departures."