mediary

An intermediary or go-between; Something or someone that passes information, instructions, or influence between one person or thing and another person or thing.

Acting to cause or connect.

Intermediate.

(medicine) occurring during the course of a disease.

(computing, dated) Storing data that is written by one process so that it can be read by another process.

(heraldry, of color) Having a primary hue (red, blue, or gold), as opposed to one that can be created by mixing colors with primary hues.

(semiotics) Defining or inferring a generalization or category of meaning.