Full record for infodump n.

Definition a large (often unwieldy or indigestible) amount of information supplied all at once; spec. as background or descriptive information in a narrative
OED requirements antedating 1987
Earliest cite in comp.sys.atari.st (Usenet newsgroup)
Comment Added to OED3 in June, 2004.
Last modified 6 July, 2008

Citations for infodump n.

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1993 D. Langford Editor my Destination in Quantum Spring–Summer 13/3 Worst of all, the crucial repetition of the ’Golly Foyle is my name‘ jingle near the end of the book is lost—jettisoned along with the disposable info-dump sentence that reminds us who the Scientific People are.
1994 Interzone May 57/2 The four young men—whose lives The Quorum traces through flashbacks and infodumps for 20 years ‥
1995 Interzone Oct. 59/2 Most of the first two hundred pages are taken up with long discussions between Moh and Janis about what is going on and what it all means, interspersed with cluttered flashbacks and long infodumps.
2001 Locus June 23/2 Kress orients the reader with her usual admirable lack of infodumps or bland narrative omniscience.
2005 Apex Sci. Fiction & Horror Digest Fall 18 Corrupt info-dumps from the Fat Merchant Princes meant we might have a rogue Accountant on our hands.
2005 C. Stross Accelerando v. 174 They'll be out of the buffer in another couple of days. Maybe a bit longer in the case of the lawyer. He's got a huge infodump packaged on his person. Probably another semisapient class-action lawsuit.