What is the best way to say OK in Latin as an exclamation?

bene habet! = "it is well, this is fine, all right, deal". This is the closest Latin has to an all-purpose acknowledging and affirmatory formula.

1. How do you say OK in Latin America?
2. Did Latin have a word for yes?
3. What language did the Loanword Cola originate?

How do you say OK in Latin America?

Vale [bah-lay]

A top used expression for Spaniards and in some countries of Latin America, 'vale' is used to say 'okay', or 'right', as when confirming or agreeing with a statement.

Did Latin have a word for yes?

Classical Latin did not have only one lexical item for 'yes'. Instead, speakers of Latin tended to employ a rich combination of words and expressions. Among these were sic, ita, vero, as well as merely repeating a phrase in full (Buck & Hale 1903, 137).

What language did the Loanword Cola originate?

Borrowed from English cola, from a Niger-Congo language.