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Hence: The effect of violent collision; vibratory shock; impression of sound on the ear. The thunderlike percussion of thy sounds. Shak.

maining unaltered or unremoved; abiding; durable; fixed; stable; lasting; as, a permanent impression. Eternity stands permanent and fixed. Dryden. Permanent gases (Chem. & Physics), hydrogen, oxygen, nitrogen, and carbon monoxide; -- also called incondensible or incoercible gases, before their liquefaction in 1877. --…

n, as an animal leaping, etc., in consequence of the persistence of the successive visual impressions of the retina. It is often arranged so that the figures may be projected upon a screen.

A luminous impression produced through excitation of the retina by some cause other than the impingement upon it of rays of light, as by pressure upon the eyeball when the lids are closed. Cf. After- image.

A more or less continued impression or image on the retina. H. Spencer.

l, or zinc, by means of the action of light and certain chemicals, so that from the plate impressions may be taken. Sir D. Brewster.

A process, analogous to photolithography, for reproducing photographed impressions transferred to zinc plate.

piece of metal on which anything is engraved for the purpose of being printed; hence, an impression from the engraved metal; as, a book illustrated with plates; a fashion plate.

The part of a printing press which presses the paper against the type and by which the impression is made.

Porcelain jasper. (Min.) See Porcelanite. -- Porcelain printing, the transferring of an impression of an engraving to porcelain. -- Porcelain shell (Zoöl.), a cowry.

Previous fitness or adaptation to any change, impression, or purpose; susceptibility; -- applied to material things; as, the predisposition of the body to disease.

Preoccupation of the mind by an opinion, or impression, already formed; preconceived opinion; previous impression; bias; -- generally, but not always, used in a favorable sense; as, the prepossessions of childhood. "The prejudices and prepossessions of the country." Sir W. Scott.

vious sentiment, conception, or opinion; previous apprehension; especially, an antecedent impression or conviction of something unpleasant, distressing, or calamitous, about to happen; anticipation of evil; foreboding.

e by which any substance or body is pressed, squeezed, stamped, or shaped, or by which an impression of a body is taken; sometimes, the place or building containing a press or presses.

A proof taken on a press, esp. to show impression, margins, color, etc.

Impression; stamp; character impressed. All saws of books, all forms, all pressures past. Shak.

To stamp something in or upon; to make an impression or mark upon by pressure, or as by pressure. Forth on his fiery steed betimes he rode, That scarcely prints the turf on which he trod. Dryden.

The quality or state of having been proved or tried; firmness or hardness that resists impression, or does not yield to force; impenetrability of physical bodies.

To take a trial impression of; to take a proof of; as, to prove a page.

an. Psychophysical time (Physiol.), the time required for the mind to transform a sensory impression into a motor impulse. It is an important part of physiological or reaction time. See under Reaction.