What does optional mean?
The adjective optional means that something is available but not compulsory. A person may freely select or decline an optional service, insurance feature, component, activity, or form, depending on the context. The distinction is one of requirement rather than preference: optional indicates that there is no obligation to choose, whereas mandatory, compulsory, and obligatory indicate that participation or inclusion is required. The word appears frequently in contracts, insurance policies, software interfaces, academic programmes, travel arrangements, and institutional forms. It can also describe optional extras offered for an additional charge, but it does not necessarily imply that these extras are rare or less valuable than the standard options. In conversation and formal writing, optional is a precise and generally neutral term for distinguishing choices from requirements.
adjectiveAvailable or permitted but not required. In contexts such as insurance, software, education, and travel, it describes a choice that a person may take without obligation.
- Not compulsory, obligatory, or required; available as a choice.
"The package includes an optional weekend excursion at no additional charge."
"Travel insurance that covers optional activities costs slightly more."
"Attendance at the seminar is optional, but the orientation is mandatory for all new staff."
Latin optionalis literally meant “of or relating to choice,” so optional has always described what you may choose.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does optional come from?
Optional entered English in the early 17th century from Medieval Latin optionalis, a form related to Latin optio, meaning “choice.” The underlying Latin verb optare, “to choose,” also gives rise to words such as option, optative, and opt. The modern adjective therefore preserves the original idea of something pertaining to a choice that may be made.
Related word forms
How optional is actually used
The term is formal but widely used in everyday, institutional, commercial, and technical contexts. It states that a requirement does not apply, without necessarily implying that the option is especially desirable.
Easily confused with optional
An option is a choice that is available, whereas optional describes something that may be chosen but is not required.
Advisory often means nonbinding or intended as guidance, while optional more precisely means that participation or inclusion is not required.