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 for least recently used
From The Free On-line Dictionary of Computing (30 December 2018) :

  least recently used
     (operating systems) (LRU) A rule used in a paging system
     which selects a page to be paged out if it has been used
     (read or written) less recently than any other page.  The same
     rule may also be used in a cache to select which cache entry
     to flush.
     This rule is based on temporal locality - the observation
     that, in general, the page (or cache entry) which has not been
     accessed for longest is least likely to be accessed in the
     near future.

Contact=webmaster@dict.org Specification=RFC 2229