Righto is a colloquialism, which means, "okay," or "understood." Some synonyms for righto are words like "affirmative," "agreed," "indeed," "yes," and "roger that." These synonyms are commonly used in formal and informal contexts, and sometimes, their usage depends on the severity and urgency of the situation. For instance, when someone is agreeing to an action to be taken, they can say "affirmative" or "agreed". These synonyms for righto are also useful in the military context, where they are used as part of the operational code to communicate important decisions and instructions. In conclusion, the synonyms for righto provide the necessary clarity and understanding in communicating important messages.