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/ɛm.pe.ɛs.i/
1.
nounfeminine
A selective first-year classe préparatoire (preparatory class) in the French higher-education system, specialising in Mathematics, Physics and Engineering Sciences.
Il est en mpsi depuis la rentrée et passe ses week-ends à réviser.
He's in MPSI since the start of term and spends his weekends revising.