What is the word that means there is a difference in import of the same words when the exact same words are spoken by a different person


I have come across this word in a book; it gives the example:



If a layman says “I now pronounce you man and wife,” it doesn't make the couple husband and wife.


But when the same words are spoken by a priest, it makes them husband and wife.



The word possibly starts with either "i" or "l".




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