Additionally

Used to introduce extra information or to indicate something that is added to what has already been said. Means 'as well as' or 'furthermore.'

Formed from 'additional' plus the suffix '-ly.' 'Additional' comes from Latin 'additionalis,' from 'additio' meaning 'a adding to,' from 'addere' (to add). The '-ly' suffix creates adverbs from adjectives. This construction pattern became standard in English during the Middle English period.