mean deviation a measure of variability, esp. in a statistical distribution, that is equal to the average of the absolute values of a set of deviations from the arithmetic mean or some other specified value.
mean distance the arithmetic average of the greatest and least distances of a planet from the sun, used to describe the size of the planet's orbit.
meanie (informal) a mean or selfish person (often used ironically).
meaningful full of meaning or significance.
meaningless empty of meaning or value; purposeless.
means test an inquiry into a person's financial status and economic resources, esp. to determine eligibility for unemployment compensation, welfare payments, low-cost housing, or the like.
meant past tense and past participle of mean1.
meanwhile at the same time; during or in the same interval of time.
measureless incapable of being measured; having no boundaries or limits; infinite.