impression
1. The pressure required to transfer ink from one
surface to another, as, for example, plate to
paper, or plate to blanket, etc. It is usually
expressed in terms of thousandths of an inch
beyond that needed to produce first contact
between two printing cylinders. 2. A printed copy
or the result of impressing ink upon a receiving
surface. 3. The indentations remaining in paper as
a result of the pressure used in letterpress
printing plus the dampness of the paper. These
impressions were often quite pronounced in early
letterpress printing. See also:CONVEX COVERS . 4.
The effect produced by stamping, blocking,
printing, or tooling a design or lettering on the
covers of a book. 5. All copies of a work printed
at one time from one setting of type. There may be
several impressions (presumably unaltered) of one
edition, each new printing from standing type or
original plates constituting a new "impression" of
the work. If, however, the pages are reimposed to
produce a different format, the resultant
impression is a different edition. 6. A single
copy of a print or map. 7. A print taken by means
of a special engraving press, from an enlarged
plate. (12 , 17 , 83 )
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