If you're looking for a word related to interjections, here are some options:
* Interjection: A word or phrase that expresses strong emotion or feeling and is used independently of a sentence. For example, "Wow!" "Ouch!" "Help!"
* Interjectional: Describing something that is in the style of an interjection. For example, "The actor's interjectional outburst made the scene more dramatic."
* Interject: To insert something abruptly into a conversation or a piece of writing. For example, "She interjected a humorous comment into the serious discussion."
It's possible that "interjectally" was meant to be a synonym for one of these words. If you provide more context about how you encountered this word, I might be able to provide a more specific answer.