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to phrases
optional ['ɔpʃ(ə)nəl] adj.
chem. à volonté; facultativement
comp. aux choix; au choix
comp., MS facultatif (Pertaining to a component, parameter and so on that is not required or automatic)
IT optionnel
law facultatif
telecom. seulement en cas de nécessité; en option
 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: 186 phrases in 41 subjects
Agriculture3
Aviation1
Commerce5
Communications7
Computers7
Construction3
Corporate governance1
Economy3
Education3
Electronics3
Finances21
Food service and catering1
Football1
General23
Grammar1
Gymnastics1
Health care2
Human rights activism10
Information technology15
Insurance5
International Monetary Fund2
Law21
Linguistics3
Marketing1
Microsoft4
Name of organization1
Natural resourses and wildlife conservation1
Patents5
Pharmacy and pharmacology1
Phonology2
Politics1
Rail transport1
Social science1
Statistics4
Tagmemics1
Taxes1
Technology1
Transport10
United Nations5
Welfare & Social Security2
Work flow2