English ⇄ Arabic Basque Bulgarian Catalan Chinese Chinese Taiwan Croatian Czech Danish Dutch English Esperanto Estonian Finnish French German Greek Hebrew Hungarian Italian Japanese Latvian Lithuanian Norwegian Bokmål Polish Portuguese Romanian Russian Scottish Gaelic Serbian Serbian Latin Slovak Slovene Spanish Swedish Turkish Ukrainian Uzbek

optional ['ɔpʃ(ə)nəl] adj.
gen.	roghainneil (Yerkwantai)
English thesaurus
optional ['ɔpʃ(ə)nəl] abbr.
abbr.	opsh
abbr., polym.	opt.
Optional ['ɔpʃ(ə)nəl] abbr.
abbr., insur.	o/p
mil., abbr.	O