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optional
 

Definitions from WordNet

Adjective optional has 1 sense
  1. optional - possible but not necessary; left to personal choice
    Antonyms:     obligatory, bounden, compulsory, mandatory, required, de rigueur, imposed, incumbent on, indispensable, prerequisite

Definitions from the Web

optional

Adjective

1. Not required or mandatory; voluntary.

2. Available as a choice but not obligatory.

Noun

1. Something that is not obligatory; a choice.

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Sample Sentences:

  1. The company offers an optional training program for its employees.

  2. Participation in the event is optional, but highly recommended.

  3. Students can choose optional subjects to study in addition to the core curriculum.

  4. The meeting next week is optional for all staff members.

  5. Your attendance at the conference is optional.

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