Etymology
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sermonize (v.)

also sermonise, 1630s, "compose or deliver a sermon; preach, especially in a dogmatic or didactic style," from Medieval Latin sermonizari, from Latin sermo (see sermon). "Chiefly depreciatory" [OED]. Occasionally also transitive, "preach a sermon to" (by 1802). Earlier verb was simply sermon "preach, preach about" (Middle English sermounen, attested in late Old English, from Old French sermoner). It survived into Elizabethan times. Related: Sermonized; sermonizing.

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Definitions of sermonize

sermonize (v.)
speak as if delivering a sermon; express moral judgements;
This man always sermonizes
Synonyms: sermonise / preachify / moralize / moralise
From wordnet.princeton.edu