serotinare Save DMLBS Du Cange serotinare [CL serotinus+-are], to be or make late. abydyn, sirocino PP; to make late, ~are CathA. SEROTINARE, Sero advenire, vel Noctem transigere, ex Epist. Senescalli Provinc. ann. 1329. in Tabul. S. Victoris Massil.