The phrase "a single impression" is correct and usable in written English.
It can be used when referring to a unique or individual perception or effect that something has on someone.
Example: "After visiting the art gallery, I was left with a single impression of the artist's unique style."
Alternatives: "one impression" or "a solitary impression".
Footprints have been found before, but usually a single impression on a stray piece of rock.
Apart from the paintings, there are 21 prints, all rare, one extant in a single impression.
The accounts aren't dramatically different, but the delay prevents them from coalescing into a single impression.
On some two-colour machines a single impression cylinder applies each sheet successively against two blanket cylinders, each of which receives a transfer from its own plate cylinder.
Depending on the consistency of the mud, either a single impression is left, or two impressions are formed from the upper and lower mouth parts.
When brought together by the dozen (here is where the show seems too big) they blur into a single impression of Steichen's manipulative skill.
Much more is understood about Egyptian mummies, but the exhibition compresses thousands of years to make a single vivid impression.
And it is telling that there is no category that can easily encompass his omnivorous solo compositions, which sound like a rich palette of styles while they are playing but do not leave a single clear impression after they end.
In the moment of running away, he doesn't think much at all, forming only a single mental impression: a lieutenant who waves a sword in an attempt to stop him must be "a peculiar creature to feel interested in such matters upon this occasion".
Sir Ralph was also the sort of man who could take a lengthy tour of Italy, as he did in 1651-2, without recording a single detailed impression of Rome, Florence or Naples — although he did note purchases of exotic souvenirs like olive oil and coffee.
Ad Price Prediction's algorithm compares the price difference between behavioral targeting and contextual targeting on a single ad impression and then serves the publisher the higher paying ad.
