Where does “predoctorate” come from?

predoctorate (English) comes from English doctorate, from Latin doctoratus, from Latin doctoro, from Latin doctor, from Latin -tor, from Proto-Italic -tōr, from Proto-Indo-European -tōr, from Proto-Indo-European -tor-s.

Ancestry of “predoctorate”, step by step

predoctorate traces back through two separate lines of ancestry.

via English doctorate

StepLanguageWordMeaning
1EnglishdoctorateThe highest degree awarded by a university...
2Latindoctoratusdoctorate, the degree of a doctor
3LatindoctoroI award a doctorate; I attain a doctorate
4Latindoctorteacher, instructor; catechist
5Latin-tor-er
6Proto-Italic-tōrForms agent nouns to verb stems
7Proto-Indo-European-tōrDerives agent nouns from verbs, denoting someone...
8Proto-Indo-European-tor-s

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 Proto-Indo-European -tor-sEvery word from Latin -torEvery word from Latin doctor