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instructive serving to inform or educate; informative; enlightening.
instructor one who teaches or instructs, esp. a teacher at a college or university.
instrument a device or tool used for highly specialized work, especially within the areas of science or medicine. [7 definitions]
instrumental serving as an agent or partial cause. [3 definitions]
instrumentalist someone who plays a musical instrument.
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]