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Adjective: optional óp-sh(u)-n(u)l
See also: elective, ex gratia, facultative, nonmandatory, nonobligatory Antonym: obligatory |
Nearest optimisation optimise optimism optimist optimistic optimistically optimization optimize optimum option optional optionality optionally optoelectronics optometrist optometry opulence opulent opulently Opuntia Opuntia cholla |