This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of, pertaining to, or deriving from illocution, the performance of acts by speaking.

"Within speech acts, Austin distinguished among locutionary, illocutionary and perlocutionary levels, but speech act theory has been devoted almost exclusively to the illocutionary level, so that ˜speech act™ and ˜illocutionary act™ are in practice synonymous terms."

locutionary    perlocutionary   

illocutionarity    illocutionary act