[im-presh-uh
n] 
| 1. | a strong effect produced on the intellect, feelings, conscience, etc. |
| 2. | the first and immediate effect of an experience or perception upon the mind; sensation. |
| 3. | the effect produced by an agency or influence. |
| 4. | a notion, remembrance, belief, etc., often of a vague or indistinct nature: He had a general impression of lights, voices, and the clinking of silver. |
| 5. | a mark, indentation, figure, etc., produced by pressure. |
| 6. | an image in the mind caused by something external to it. |
| 7. | the act of impressing; state of being impressed. |
| 8. | Dentistry. a mold taken, in plastic materials or plaster of Paris, of teeth and the surrounding tissues. |
| 9. | an imitation of the voice, mannerisms, and other traits of a person, esp. a famous person, as by an entertainer: The comedian did a hilarious impression of the president. |
| 10. | Chiefly Printing.
|
| 11. | Metalworking. a portion of a die having in reverse the intended form of an object to be forged. |
| im·pres·sion (ĭm-prěsh'ən) n.
Synonyms: These nouns denote a visible mark made on a surface by pressure: an impression of a notary's seal on wax; the impress of bare feet in the sand; a medal with the imprint of a bald eagle; the print of automobile tires in the tar; a gold ingot with the refiner's stamp. |
Impression
An advertisement's (usually a banner ad) appearance on a web page. Ad space is often sold on a CPM basis.
Investopedia Commentary
For example, if the page you're on shows five ads, that's five impressions. On this particular page there are two impressions, one for the banner at the top and one for the banner on the bottom of the page.
See also: Banner Advertising, Click Through Rates, CPC, CPM
impression im·pres·sion (ĭm-prěsh'ən)
n.
An effect, a feeling, or an image retained as a consequence of experience.
A mark or indentation made by the pressure of one organ on the surface of another.
An imprint of the teeth and surrounding tissues, formed with a plastic material that hardens into a mold for use in making dentures, inlays, or plastic models.