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optional ['ɔpʃ(ə)nəl] adj.
comp., MS optioneel (Pertaining to a component, parameter and so on that is not required or automatic)
 English thesaurus
Optional ['ɔpʃ(ə)nəl] abbr.
abbr., insur. o/p
mil., abbr. O
optional ['ɔpʃ(ə)nəl] abbr.
abbr. opsh
abbr., polym. opt.
Optional: 105 phrases in 21 subjects
Agriculture2
Communications6
Construction2
Education3
Electronics3
Finances9
General12
Health care1
Human rights activism10
Information technology16
Insurance3
Law12
Marketing1
Microsoft4
Pharmacy and pharmacology1
Politics1
Social science2
Technology2
Transport12
United Nations2
Work flow1