Speechifying
/ˈspiːtʃɪfaɪɪŋ/
Definition 1 of 1
Pro Tip 1/3Persuasive intent
Speechifying is often used to convince listeners about an idea or policy. 
The mayor was speechifying on the benefits of the new public park.
Pro Tip 2/3Political context
Commonly used in political or formal settings where lengthy speaking is expected. 
During the rally, the activists took turns speechifying on climate change.
Pro Tip 3/3Can be negative
Sometimes implies the speaker is pompous or excessively formal. 
Everyone was tired of the professor's speechifying on subjects they already knew.