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Attendance at the meeting is optional.

What is the synonym of 'optional' here?

Is it nonobligatory? I looked 'nonobligatory' up, but I didn't find in the dictionary.

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It somewhat depends on the context. Look at the words mandatory, compulsory, required.

Clive

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Omar Ahmed

Attendance at the meeting is optional.

What is the synonym of 'optional' here?

Is it nonobligatory? I looked 'nonobligatory' up, but I didn't find in the dictionary.

'optional' is such a nice word. It would be a shame to replace it with a clumsy word. Nevertheless, 'nonmandatory' (also 'non-mandatory') exists. It's listed in the Oxford dictionary online. Here's one of their examples:

Nineteen of the 30 respondents indicated that their departments offered non-mandatory statistics courses.

CJ

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Comments  
Omar AhmedIs it nonobligatory? I looked 'nonobligatory' up, but I didn't find in the dictionary.

You are free to make any word you like with affixes, especially "non-". But it wants a hyphen, "non-obligatory", because it is not a known solid word, and because it looks weird without it—you read "nono" and have to backtrack. The dictionaries will not list it (or other similar words in "un-" and its variants) because pretty much any noun or adjective can do that, and it's a waste of paper to list them if they have the expected meaning. The dictionaries will list the primary solid forms and some other common ones, especially if their meaning is specific, like "nonconformist", or has drifted, like "nonsense".

Still, I would fish around for a more conventional synonym like "not required".

 CalifJim's reply was promoted to an answer.
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