Meridian is one of the traditional channels along which qi is said to flow, the map used to choose points.
In 📝Acupressure a point is located on that map, then pressed. The channel is a working picture from a living tradition, not a dissected vessel, not a nerve, and not a claim to treat qi as a disease. Related to 📝Sen Lines as another line-based map. The session test is whether the point contact feels useful, not whether a textbook meridian has been "opened."
Clients feel a path of points. Sharp, numb, or panicky sensation is a stop. This practice does not needle.