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 ?
The most commonly used preliminary impression material in this survey was irreversible hydrocolloid by (76%).
If these dentures are unacceptable then diagnostic casts can be generated from a preliminary impression. And if the denture is not adapted to the mucosa, a refitting or relining can be made.
The preliminary impression was that of a bleeding GI stromal tumour and care was transferred to the surgical team for consideration of surgical intervention.
It was now up to the PM to present evidence and legal reasons to show how, if at all, the preliminary impression was unfounded.
This preliminary impression was filled using dental stone type IV (Herostone, Vigodent, Petropolis, RJ, Brazil) to obtain a replica of the artificial canine (control).
Even where the transcriptionist/editor received the report, we asked each radiologist to go ahead and self-correct their preliminary impression.

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