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optional ['ɔpʃ(ə)nəl] adj.
comp., MS	オプションの (Pertaining to a component, parameter and so on that is not required or automatic)
construct.	任意 (にんい); 随意 (ずいい)
adj-na optional | adj-na ['ɔpʃ(ə)nəl] adj.
gen.	選択的 (せんたくてき); 随意的
n optional | n ['ɔpʃ(ə)nəl] adj.
gen.	オプショナル
adj-na n optional | adj-na n ['ɔpʃ(ə)nəl] adj.
gen.	随意 news2 nf25 spec2 (ずいい)
adj-no optional | adj-no ['ɔpʃ(ə)nəl] adj.
gen.	要否 (items)
n optional | n ['ɔpʃ(ə)nəl] adj.
comp.	任意信号
n vs adj-no optional | n vs adj-no ['ɔpʃ(ə)nəl] adj.
gen.	オプション gai1 (opushon)
adj-no adj-na n optional | adj-no adj-na n ['ɔpʃ(ə)nəl] adj.
gen.	任意 ichi1 news1 nf08 (にんい)
English thesaurus
optional ['ɔpʃ(ə)nəl] abbr.
abbr.	opsh
abbr., polym.	opt.
Optional ['ɔpʃ(ə)nəl] abbr.
abbr., insur.	o/p
mil., abbr.	O

optional : 23 phrases in 6 subjects

Computers	7
General	7
Law	1
Microsoft	5
Patents	2
Physics	1