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interfile

American  
[in-ter-fahyl] / ˌɪn tərˈfaɪl /

verb (used with object)

interfiled, interfiling
  1. to combine two or more similarly arranged sets of items, as cards or documents, into a single file.


interfile British  
/ ˌɪntəˈfaɪl /

verb

  1. to place (one or more items) among other items in a file or arrangement

  2. to combine (two or more sets of items) in one file or arrangement

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of interfile

First recorded in 1945–50; inter- + file 1