mental impression --> impression
3. That which is impressed; stamp; mark; indentation; sensible result of an influence exerted from without. The stamp and clear impression of good sense. (Cowper) To shelter us from impressions of weather, we must spin, we must weave, we must build. (barrow)
4. The pressure of the type on the paper, or the result of such pressure, as regards its appearance; as, a heavy impression; a clear, or a poor, impression; also, a single copy as the result of printing, or the whole edition printed at a given time. Ten impressions which his books have had. (Dryden)
Origin: F. Impression, L. Impressio.