To speak rhetorically; to make a formal speech or oration; to harangue; specifically, to recite a speech, poem, etc., in public as a rhetorical exercise; to practice public speaking; as, the students declaim twice a week.
To speak for rhetorical display; to speak pompously, noisily, or theatrically; to make an empty speech; to rehearse trite arguments in debate; to rant.
To utter in public; to deliver in a rhetorical or set manner.
To defend by declamation; to advocate loudly.
declaim in Dutch is declameren, voordragen
declaim in German is deklamieren, deklamatiere, vortragen
declaim in Italian is declamarg
declaim in Latin is pronuntio
declaim in Swedish is orera