An intermediary or go-between; Something or someone that passes information, instructions, or influence between one person or thing and another person or thing.
occurring during the course of a disease.
Having a primary hue (red, blue, or gold), as opposed to one that can be created by mixing colors with primary hues.
Defining or inferring a generalization or category of meaning.
Acting to cause or connect.
Intermediate.
An operative person or thing.
Any of a class of behaviors that produce consequences by operating (i.e., acting) upon the environment.
That operates to produce an effect.