Recent coverage of Gaza and the West Bank illustrates that, while corporate media occasionally outright call for expelling Palestinians from their land, more often the way these outlets support ethnic cleansing is by declining to call it ethnic cleansing.
Nobody is saying the dictionary is wrong, they’re saying that there are international groups that have specific definitions for what qualifies as genocide and those don’t necessarily line up with the dictionary. Saying the dictionary is wrong because of the organizations’ use or the organizations are wrong because of the dictionary’s use are both foolish.
I’d argue that the convention on genocide serves as a dictionary in this case. It’s the most common and accepted definition, and it includes cultural forms of genocide, not just physical ones.
Neither is wrong, they just serve different purposes. Dictionaries track usage of the general populace, not industry experts. It’s wrong to use the dictionary as evidence that the convention on genocide is using the term incorrectly though, definitely.