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one-piece

[wuhn-pees]
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adjective
  1. complete in one piece, as a garment: a one-piece snowsuit.
noun
  1. Also called one-piec·er. a one-piece garment.

Origin of one-piece

First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for one piece

one-piece

adjective
  1. (of a garment, esp a bathing costume) made in one piece
noun
  1. a garment, esp a bathing costume, made in one piece
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012