acronym ac‧ro‧nym [ˈækrənɪm] noun [countable]
a word made up of the first letters of the name of something such as an organization. For example, NATO is an acronym for the North Atlantic Treaty Organization

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acronym UK US /ˈækrəʊnɪm/ noun [C]
an abbreviation consisting of the first letters of each word in the name of something, pronounced as a word: an acronym for sth »

PIPE is an acronym for private-investment, public-equity.

Financial and business terms. 2012.