Immune, im-mūn′, adj. free from obligation: not liable to infection.—n. Immun′ity, state of being immune: exemption: privilege. [Fr.,—L. in, not, munis, serving, obliging.]

Immure, im-mūr′, v.t. to wall in: to shut up: to imprison.—n. (Shak.) a wall.—n. Immure′ment, imprisonment. [Fr.,—L. in, in, murus, a wall.]

Immutable, im-mūt′a-bl, adj. unchangeable.—ns. Immutabil′ity, Immūt′ableness, unchangeableness.—adv. Immūt′ably.

Imp, imp, n. a little devil or wicked spirit: a son, offspring, a pert child.—v.t. (falconry) to mend a broken or defective wing by inserting a feather: to qualify for flight.—adj. Imp′ish, like an imp: fiendish. [A.S. impe—Low L. impotus, a graft—Gr. emphytos, engrafted.]

Impacable, im-pāk′a-bl, adj. (Spens.) not to be quieted or appeased. [L. in, not, pacāre, to quiet.]

Impact, im-pakt′, v.t. to press firmly together: to drive close.—n. Im′pact, a striking against: collision: the blow of a body in motion impinging on another body: the impulse resulting from collision.—Impacted fracture (surg.), when one part of the bone is forcibly driven into the other. [O. Fr. impacter—L. impactus, pa.p. of impingēre. See Impinge.]

Impaint, im-pānt′, v.t. (Shak.) to paint.

Impair, im-pār′, v.t. to diminish in quantity, value, or strength: to injure: to weaken.—v.i. (obs.) to become worse.—n. Impair′ment. [O. Fr. empeirer (Fr. empirer), from L. im (=in), inten., and L. pejorāre, to make worse—L. pejor, worse.]

Impair, im-pār′, adj. (Shak.) unsuitable. [Fr.,—L. imparin, not, par, equal.]

Impale, im-pāl′, v.t. to fence in with stakes: to shut in: to put to death by spitting on a stake.—n. Impale′ment, an enclosed space: (her.) the marshalling side by side of two escutcheons combined in one. [Fr. empaler—L. in, in, palus, a stake.]