Definition of "proteome"

Two-dimensional (2-D) gel electrophoresis allows the separation of thousands of proteins, and provides the means for separating the proteome (the PROTEin complement expressed by a genOME) of a simple species, or the protein component of a complex tissue.

1996 January, Marc R. Wilkins, “From Proteins to Proteomes: Large Scale Protein Identification by Two-Dimensional Electrophoresis and Amino Acid Analysis”, in Nature Biotechnology, volume 14, page 61

So now the quest is to crack the human proteome – a concept so novel that the term proteome didn't even exist a decade ago.

2003, Bill Bryson, A Short History of Nearly Everything, BCA, published 2003, page 367