point of departure


noun

Nautical. the precise location of a vessel, established in order to set a course, especially in beginning a voyage in open water.
a place to begin, as in a discussion, argument, etc.

Origin of point of departure

First recorded in 1855–60
Also called departure.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019