A portfolio spread out over many securities in such a way that the weight of any security is small. The risk of a well-diversified portfolio closely approximates the systemic risk of the overall market , the unsystematic risk of each security having been diversified out of the portfolio.
WELL DIVERSIFIED PORTFOLIO
Meaning of WELL DIVERSIFIED PORTFOLIO in English
Campbell R. Harvey. Hypertextual finance English glossary. Английский словарь гипертекстовых финансов. 2012