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中文
English Fox - English Dictionary
Meaning of
optional
in English
optional
us
/oʊˈpʃənəl/
uk
/ˈɒpsəntl/
#common
Definitions
Adjective
not
required
;
left
to
choice
Noun
a
non-compulsory
part
of
a
course
a
variable
that
may
or
may
not
hold
a
value
