impression

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impression

Dentistry an imprint of the teeth and gums, esp in wax or plaster, for use in preparing crowns, inlays, or dentures
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

impression

[im′presh·ən]
(geology)
A form left on a soft soil surface by plant parts; the soil hardens and usually the imprint is a concave feature.
(graphic arts)
A print made from an engraved plate.
A press run or printing of a book.
(metallurgy)
A machined cavity in a forging die for production of a specific geometric shape in the workpiece.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

impression

An advertisement on a Web page. If ads on the Web are not based on a click-through rate (CTR), they are typically sold on a cost per thousand (CPM) basis. One impression is one banner ad displayed on one page. Also called a "view" or "ad view." See banner ad, interstitial ad, pay-per-click and click-through rate.
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References in periodicals archive ?
(Figure-2 A) Impression copings were placed on the implants and impression taken using polyvinyl siloxane impression material.