What does interaction_average=TRUE mean?

Sorry for the very simple stats question. Running a post-hoc Tukey on a term (presence of a species) that interacts with another term (drought). I just want to run a Tukey on the main effect of presence of the species (which I call "inv"), so I typed:

...mcp(inv="Tukey", interaction_average = TRUE)))

This works, but I want to know what "interaction_average=TRUE" means

Thank you

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