We don't have synonyms for optionality yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are nationality, rationality and notionality.
(n) :
the potential for making additional choices which are available only after an initial choice; the value of additional optional investment opportunities available only after having made an initial investment
"the short-term payoff for this is modest, but the optionality value is enormous."
(n) :
the potential for making additional choices which are available only after an initial choice; the value of additional optional investment opportunities available only after having made an initial investment
"the short-term payoff for this is modest, but the optionality value is enormous."