Line 23: How is the word interest used in national debate today? What are some examples of phrases containing the word interest?

Federalist No. 10

The usage of interest happens in the meaning of what is best for the nation (or the nation according to the one using such word). Its a rather vague concept that can both mean and put weight to a lot of other concepts and ideas.

The other use for the word may be in the sense of interest rate, a term from economy that means the extra cost that is put upon debt or such.

Examples of interest being used:

"Voter interest in the midterm elections has surged to records within both parties ( ...) "

" ( ...) US Fed raising interest rates ( ...)"