Where does “infodump” come from?

infodump (English) comes from English info, from English information, from Middle English enformacioun, from Latin īnfōrmātiō, from Latin -tiō, from Latin dissertātiō, from Latin dissertus, from Latin disserere — small stone, pebble; gravel, rubble.

Ancestry of “infodump”, step by step

infodump traces back through two separate lines of ancestry.

via English info

StepLanguageWordMeaning
1Englishinfoinformation
2EnglishinformationThat which resolves uncertainty; anything that...
3Middle EnglishenformaciounTeaching, education; the dissemination of knowledge
4Latinīnfōrmātiōsketch, idea, conception
5Latin-tiōtion, -ation, -ing
6Latindissertātiō(spoken) dissertation, discourse, disquisition
7Latindissertusarranged, disposed; explained
8Latindissereresecond-person singular future passive indicative...
9Latindis-asunder, apart, in two; reversal, removal;...
10Latincalceusshoe
11Latincalxlimestone; chalk; the finish line
12Ancient Greekχάλιξsmall stone, pebble; gravel, rubble

via English dump

StepLanguageWordMeaning
1EnglishdumpA place where waste or garbage is left; a ground...
2Middle Englishdumpen
3Old Norsedumpato thump
Every word from Ancient Greek χάλιξEvery word from Latin -tiōEvery word from Latin dis-
infodump — Etymology, Origin & Word History | Etymology Explorer