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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: 1 phrase in 1 subject

Microsoft

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