Optional | Definition of Optional by Merriam-Webster
Optional definition is - involving an option : not compulsory. How to use optional in a sentence.
Optional | Definition of Optional at Dictionary.com
Optional definition, left to one's choice; not required or mandatory: Formal dress is optional. See more.
Optional - definition of optional by The Free Dictionary
In fact, the optional service to a certain extent to meet the needs of customers is a stimulating factor, so we assume that the demand is subject to the impact of optional services.
Optional Synonyms, Optional Antonyms | Thesaurus.com
Synonyms for optional at Thesaurus.com with free online thesaurus, antonyms, and definitions. Find descriptive alternatives for optional.
OPTIONAL | meaning in the Cambridge English Dictionary
optional definition: 1. If something is optional, you can choose if you want to do it, pay it, buy it, etc.: 2. not necessary or demanded but possible or available; depending on what you decide to do: 3. something that is optional is something that you can buy or do if you want to, but that you do…. Learn more.
optional - Wiktionary
Not compulsory; left to personal choice; elective. On that beach clothing is entirely optional.··Something that is not compulsory, especially part of an academic course. (programming) In the Swift programming language, a kind of variable that is assigned a specific data type but may or may not hold an actual value.