noun
oratory
OR-uh-tor-ee/ˈɔːrətɔːri/
The art or skill of formal public speaking.
Her skill in oratory keeps the audience attentive throughout the speech.

Etymology
The speaking and pleading of Latin orare underlie ars oratoria, the “art of speaking.” The phrase identifies public address as a practiced skill, rather than speech in general.
In context
The other thing that religions are really aware of is: speak well … but oratory, oratory is absolutely key to religions.
the force of his oratory was so powerful that Cicero was able to convince Catiline that he is known that he's exposed…
More examples
- The course teaches oratory through practice speeches and feedback.
- He studies great speeches to improve his oratory.
- Effective oratory combines clear arguments with a confident delivery.
Forms
orator noun — A person skilled in formal public speaking.
oratorical adjective — Relating to formal public speaking.