Fromoptional +‎-ly.

• (US, Canada)IPA^(key): /ˈɑpʃənəli/

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optionally (comparativemoreoptionally,superlativemostoptionally)

1. In anoptional manner; notmandatorily.
   • 1979,Ladakhi grammar,→ISBN, page104:

     Plural suffixes may beoptionally added after the Ist person exclusiveƞə—z̆e, Ist person inclusiveƞə—təƞ, and IInd person non-honorific khyo—z̆e and honorific ñe—z̆e.

• facultatively

• mandatorily

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