Imperator, im′pē-rā-tor, n. a commander: a ruler: an emperor.—adj. Imperatō′rial. [L.,—imperāre, to command.]
Imperceptible, im-pėr-sep′ti-bl, adj. not discernible: insensible: minute.—ns. Impercep′tibleness, Imperceptibil′ity.—adv. Impercep′tibly.—adjs. Impercep′tive, not perceiving; Impercip′ient, having no power to perceive.
Imperfect, im-pėr′fekt, adj. incomplete: defective: not fulfilling its design: liable to err.—adv. Imper′fectly.—ns. Imper′fectness, Imperfec′tion.
Imperforate, -d, im-pėr′fo-rāt, -ed, adj. not pierced through: having no opening.—adj. Imper′forable, that cannot be perforated or bored through.—n. Imperforā′tion.
Imperial, im-pē′ri-al, adj. pertaining to an empire or to an emperor: sovereign, supreme: commanding, of superior size or excellence.—n. a tuft of hair on the lower lip (from its use by Napoleon III.): a kind of dome, as in Moorish buildings: an outside seat on a diligence: a size of writing-paper, 22 × 30 in.; also of printing-paper, 22 × 32 in.—v.t. Impē′rialise, to make imperial.—ns. Impē′rialism, the power or authority of an emperor: the spirit of empire; Impē′rialist, one who belongs to an emperor: a soldier or partisan of an emperor; Imperial′ity, imperial power, right, or privilege.—adv. Impē′rially.—n. Impē′rium, a military chief command: empire.—Imperial city, Rome: one of those cities in the German Empire which owed allegiance to none but the emperor, which exercised suzerain rights within their own territories, and had the right of sitting and voting in the imperial diet; Imperial Institute of the United Kingdom, the Colonies, and India, an institution designed to commemorate the Jubilee of Queen Victoria (1887). [Fr.,—L. imperialis—imperium, sovereignty.]
Imperil, im-per′il, v.t. to put in peril: to endanger.—n. Imper′ilment.
Imperious, im-pē′ri-us, adj. assuming command: haughty: tyrannical: authoritative: (obs.) imperial.—adv. Impē′riously.—n. Impē′riousness. [L. imperiosus.]
Imperishable, im-per′ish-a-bl, adj. indestructible: everlasting.—ns. Imper′ishableness, Imperishabil′ity.—adv. Imper′ishably.
Impermanence, im-per′man-ens, n. want of permanence.—adj. Imper′manent.
Impermeable, im-pėr′mē-a-bl, adj. not permitting passage: impenetrable.—ns. Impermeabil′ity, Imper′meableness.—adv. Imper′meably.—n. Imper′meātor, a device in a steam-engine for forcing lubricating oil uniformly into the cylinder.