Is there a lingustic term for okurigana omission? Is there a (Japanese) linguistic term for okurigana omission (cases when is written as , etc.)? If not then what would be a concise way to refer to the phenomena (in Japanese)?

Being a non-linguist, I have no idea if this term is used in linguistics, but our {} (Agency for Cultural Affairs) calls it {} ("tolerance").

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To refer to the phenomenon, you could use a phrase like:

{}{}{}{}{}{}{}{}

That would be understood by all native-speakers, I promise.