Backronym meaning

băk'rə-nĭm'
An acronym coined from an existing word or name. For example, wiki is a backronym when used for what I know is because wiki is a word whose original meaning is “collaborative website.”
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(BACKward acRONYM) A reverse acronym. Instead of turning a multi-word term into letters, such as "central processing unit" into CPU, a given set of letters becomes a multi-word term. For example, TEMPEST was a code name that was turned into "Telecommunications Electronics Material Protected from Emanating Spurious Transmissions." DVD originally meant "digital video disc" but was later changed to "digital versatile disc." See acronym.
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The treatment of a word as an acronym even though it is not. For example, ping is a utility used to test a path from one host computer to another across an IP-based network in what is essentially a command to echo the packet from the remote host computer back to the originating host. Ping is a word, not an acronym. However, Dr. David L. Mills reverse-engineered ping into an acronym for packet Internet groper and a great many people believe that was the original meaning. It was not. See also acronym, anacronym, and ping.
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A word that is either not an acronym but is taken to be one and for which a full form is invented by back-formation, or is an acronym and for which an alternative full form is invented by back-formation.
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Origin of backronym

Blend of back and acronym