nominal size

(design engineering) Size used for purposes of general identification; the actual size of a part will be approximately the same as the nominal size but need not be exactly the same; for example, a rod may be referred to as ¼ inch, although the actual dimension on the drawing is 0.2495 inch, and in this case ¼ inch is the nominal size.

The dimensions of sawn lumber before it is dried or surfaced. Also see dressed size.