optionally

From optional +‎ -ly.

• (US, Canada) IPA^(key): /ˈɑpʃənəli/

• Audio (Southern England):

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• Audio (US):

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optionally (comparative more optionally, superlative most optionally)

1. In an optional manner; not mandatorily.
   • 1979, Ladakhi grammar, →ISBN, page 104:

     Plural suffixes may be optionally added after the Ist person exclusive ƞə—z̆e, Ist person inclusive ƞə—təƞ, and IInd person non-honorific khyo—z̆e and honorific ñe—z̆e.

• facultatively

• mandatorily