Definition of "one-piece"

one-piece

adjective
not comparable
1. Composed of a single integral unit or so appearing.
  Quotations
  The two-axle bogies, of Metro-Vick swing-link type, are of one-piece cast-steel construction with box-section side frames and headstocks.
  1960 December, “The first hundred 25 kV a.c. electric locomotives for B.R.”, in Train Illustrated, page 728
noun
plural one-pieces
1. A one-piece article of clothing, especially a swimsuit.