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Optional

//ˈɒp.ʃə.nəl// adj, noun

Definitions

Adjective
  1. 1
    Not compulsory; left to personal choice; elective. not-comparable

    "On that beach clothing is entirely optional."

Adjective
  1. 1
    possible but not necessary; left to personal choice wordnet
Noun
  1. 1
    Something that is not compulsory, especially part of an academic course.
  2. 2
    In various programming languages, a kind of variable that is assigned a specific data type but may or may not hold an actual value. capitalized, sometimes

    "In functional languages, there is a data type called the option type, also called the maybe type. Its purpose is to encapsulate a value, which is returned from a function. […] In Java 8, the Optional class has been added to serve as an option type."

Etymology

Etymology 1

From option + -al.

Etymology 2

From option + -al.

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