optional 1
adjectivedomain: all adj
Princeton WordNet [ver.3.1]
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EnglishDefinition
possible but not necessary; left to personal choice
Pertainym (pertains to noun)
optionally 1
adverb
in an optional manner
EnglishAntonym
obligatory 1
adjective
morally or legally constraining or binding
Similar_to
elective 2
adjective
not compulsory
ex gratia 1
adjective
as a favor; not compelled by legal right
nonmandatory 1
adjective
not required by rule or law
