Where does “preoccupational” come from?

preoccupational (English) comes from English occupational, from English occupation, from Middle English occupacioun, from Middle French occupation, from Latin occupatio, from Latin -tiō, from Latin dissertātiō, from Latin dissertus — small stone, pebble; gravel, rubble.

Ancestry of “preoccupational”, step by step

preoccupational traces back through two separate lines of ancestry.

via English occupational

StepLanguageWordMeaning
1EnglishoccupationalOf, belonging, or relating to an occupation
2EnglishoccupationAn activity or task with which one occupies...
3Middle Englishoccupacioun
4Middle Frenchoccupation
5Latinoccupatioseizing, occupying; occupation, employment;...
6Latin-tiōtion, -ation, -ing
7Latindissertātiō(spoken) dissertation, discourse, disquisition
8Latindissertusarranged, disposed; explained
9Latindissereresecond-person singular future passive indicative...
10Latindis-asunder, apart, in two; reversal, removal;...
11Latincalceusshoe
12Latincalxlimestone; chalk; the finish line
13Ancient Greekχάλιξsmall stone, pebble; gravel, rubble

via English pre

StepLanguageWordMeaning
1EnglishpreBefore; Precum, Cowper's fluid, pre-ejaculate; To...
2Latinpraebefore; in front; in front of
3Proto-Italicpraibefore; in front of
4Proto-Indo-Europeanpreh₂-before, in front
5Proto-Indo-Europeanper-before, in front; first; to go through
6Proto-Indo-Europeanpr̥tóspassed , crossed
Every word from Ancient Greek χάλιξ