Late 19th century. From panegyr- + -ism. Compare Hellenistic Greek πανηγυρισμός, Byzantine Greek πανηγύρισμα celebration of a public festival, post-classical Latin panegyrismus.
Definition of panegyrism in US English:
panegyrism
nounˌpanɪˈdʒɪrɪz(ə)m
rare
A panegyric, a eulogy; a compliment.
Origin
Late 19th century. From panegyr- + -ism. Compare Hellenistic Greek πανηγυρισμός, Byzantine Greek πανηγύρισμα celebration of a public festival, post-classical Latin panegyrismus.