IPA: /dɪˌklæməˈʃən/
KK: /dɪˈklæməˌʃən/
A formal speech or recitation that is often delivered with strong emotion or passion, usually as a practice in public speaking or rhetoric.
The student impressed everyone with her declamation at the school competition.
Declamation is formed from "de-" (meaning down or away) and "clamare" (meaning to shout or proclaim). The word refers to the act of speaking or delivering a speech in a formal or dramatic manner, often with emphasis and emotion.
Think of 'shouting' ('clamare') something 'down' or 'away' ('de-') — that's why declamation means delivering a speech with strong expression.