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.
Additionally demonstrates how English loves to stack suffixes like building blocks - we took Latin 'add,' added '-tion' to make 'addition,' then '-al' for 'additional,' and finally '-ly' for 'additionally.' This four-layer linguistic sandwich shows English's remarkable ability to create precise meanings through morphological accumulation.
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