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Synonyms for Propaedeutic (same or very similar meaning)

WordNet sense 1 (a course that provides an introduction to an art or science (or to more advanced study generally)):
propaedeutics

WordNet sense 2 (preceding and preparing for something):
preparatory, preparative

WordNet sense 3 (existing or coming before):
preceding


From the ODE community, based on WordNetadd/edit