obligatorystartingpoint

noun
UK /əˈblɪɡətəri ˈstɑːtɪŋ pɔɪnt/
US /əˈblɪɡətɔːri ˈstɑːrtɪŋ pɔɪnt/

A place where you must begin.

The front gate is the obligatory starting point for the tour.


OTHER MEANINGS

2. The fixed first step in a process that cannot be skipped.

Filling out the form is the obligatory starting point for any application.

3. A rule-based place where a journey or activity must begin.

The trailhead serves as the obligatory starting point for the hike.

4. The required base from which all later work is measured.

The survey data became the obligatory starting point for the study.