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optional

Main Entry:: op·tion·al
Pronunciation:: \ˈäp-shnəl, -shə-n^əl\
Function:: adjective
Date:: 1765

: involving an option : not compulsory

— op·tion·al·i·ty

\ˌäp-shə-ˈna-lə-tē\ noun

— op·tion·al·ly adverb

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