Provisionally rhymes with:
occasionally, additionally, conditionally, congressionally, constitutionally, conventionally, criminally, diagonally, educationally, exceptionally, fractionally, functionally, generationally, institutionally, intentionally, internationally, irrationally, marginally, medicinally, nationally, nominally, nutritionally, occasionally, operationally, originally, personally, phenomenally, professionally, proportionally, rationally, regionally, rotationally, seasonally, terminally, traditionally, unconditionally, unconstitutionally, unintentionally
Provisionally sounds like:
professional, professionally, provisional