by the unit

by the (unit)

For each unit, as of items sold in this manner. How much does this meat cost by the pound?
See also: by

by the unit

Fig. each; per. (Used to designate the unit of measure, but not the rate of a measure.) Lettuce is sold by the head. Gas is sold by the gallon.
See also: by, unit
References in periodicals archive ?
CIA Unit administrators stress that the services provided by the unit should not be considered a substitute for a thorough, well-planned investigation; rather, their services augment traditional investigative crime-solving methods.