additiona
additiona is a term that appears to be a misspelling or an incomplete word. In standard English, there is no recognized word spelled "additiona". It is likely that the intended word was "additional" or "addition".
"Additional" is an adjective that means "added, extra, or more". For example, one might request "additional help"
"Addition" is a noun that refers to the act or process of adding something, or the result
Without further context, it is impossible to determine the precise meaning or intent behind the term "additiona".