Cars & Driving

  • noun the upper layer of a plain bearing insert



  • A layer of concrete or mortar, seldom thinner than 1" (25 millimeters), placed on and usually bonded to the worn or cracked surface of a concrete slab either to restore or to improve the function of the original surface.
  • The surfacing of a plywood face with a solid material other than wood. See also overlaid plywood.


  • To cover a surface with a layer or design. Also, that which is placed over, or which otherwise covers something else. For example, a graticule placed over the screen of an oscilloscope.
  • The superimposition or insertion of one image onto or into another. Used, for instance, to place a computer-generated image onto a filmed image.
  • The use of the same area of a computer's RAM for multiple segments of the same program. When the size of a program exceeds the memory capacity of a given system, segments that are not needed at a given instant are shuttled out of the main memory, and when needed are shuttled back in, each time overwriting the segment which had been there earlier.
  • An area code whose boundaries are the same as those of another area code. That is, both area codes serve the same specific region or zone. Also called area code overlay (2).

Information & Library Science

  • noun a transparent sheet used with overhead transparencies to add information at a specific time and place


  • noun a transparent plastic sheet placed over artwork with instructions for changing it, or showing the artwork is to be printed

Media Studies

  • noun in traditional methods of printing, a piece of paper used to add more pressure on a forme or printing plate where the type is not printing evenly
  • verb to attach a piece of paper to parts of the surface of an old-fasioned printing press to help make a uniform impression on a forme or plate


  • noun a piece of transparent paper or plastic, marked with boundaries, positions, routes, and other information relating to an operation, which is designed to be placed over a map as a means of briefing the participants.


  • verb to change the height of type and blocks in letterpress printing, so as to alter the darkness of the printed text