Definition of "optionally" []

• In an optional manner. Not mandatorily. (adverb)

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• "* Themes may '' 'optionally' '' include a Theme Option to display additional credit links or text."
• "In 2006, SpaceX won the NASA COTS competition to demonstrate transport of cargo and optionally crew to and from the International Space Station."
• "Each appeared in his or her own box on a dark screen and I could optionally see myself in a smaller box."