What is another word for not obligatory?
Pronunciation: [nˌɒt əblˈɪɡətəɹˌi] (IPA) 
When something is not obligatory, it means that it is not mandatory or required. A few synonyms to describe this term include optional, voluntary, discretionary, noncompulsory, and elective. When something is optional, it means that a person can choose to do it or not. Voluntary refers to something that is done by choice and not under compulsion. Discretionary is another term that is used to describe something that is left up to a person's judgment or decision. Noncompulsory refers to something that is not mandatory, while elective refers to something that is chosen freely. All these synonyms convey the idea that something is not required but rather a choice.
