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instrumentality the means by which something is done; agency. [2 definitions]
instrumentally by, using, or with an instrument. [2 definitions]
instrumentation the method or practice of arranging music for instruments. [3 definitions]
instrument landing a landing accomplished only by means of the instruments of an aircraft and signals from the ground, rather than by visual observation.
instrument panel a panel of meters, gauges, and controls, as in an automobile, aircraft, or spacecraft.
in stud for hire for breeding, as a stallion.
insubordinate unwilling to respect or submit to authority; disobedient. [2 definitions]
insubordination unwillingness to obey orders or submit to authority.
insubstantial lacking firmness or substance; not substantial; slight. [2 definitions]
insufferable incapable of being tolerated or endured; unbearable.
insufficiency the quality or condition of being insufficient; deficiency; lack. [2 definitions]
insufficient inadequate in number, degree, amount, or quality; not sufficient.
insular of or relating to an island or the formation of an island. [4 definitions]
insularity the condition of being closed to new ideas or outside influences; narrow-mindedness.
insulate to cover, line, or surround with a substance that reduces or stops the transfer of heat, electricity, or sound. [2 definitions]
insulation material used to insulate. [2 definitions]
insulator a person, thing, or material that insulates. [2 definitions]
insulin a hormone of the pancreas that controls the metabolism of carbohydrates by regulating the level of glucose in the blood. [2 definitions]
insulin shock hypoglycemia caused by excessive insulin in the blood, and characterized by shakiness, cold sweat, convulsions, and eventually coma.
insult to offend by speaking to or treating rudely or contemptuously. [4 definitions]
in sum in concise form or summary.