Colors can be measured and quantified in various ways; indeed, a person's perception of colors is a subjective process whereby the brain responds to the stimuli that are produced when incoming light reacts with the several types of cone cells in the eye.
unit of service. unit of service. any individual, family, aggregate, organization, or community given nursing care. The level at which service is delivered varies with the particular unit entity.
military service-land tenure by service in the lord's army. service - (law) the acts performed by an English feudal tenant for the benefit of his lord which formed the consideration for the property granted to him.