It serves everyone to have relatively stable meanings for words and phrases. "Relatively" because of course there is natural drift over time. But if today I wri

It serves everyone to have relatively stable meanings for words and phrases. "Relatively" because of course there is natural drift over time. But if today I write "big data" and it means "millions of rows in Excel" to Bob but "hundreds or thousands of terrabytes" to Jane, it's effectively useless to use in communication. Put another way, that Bob thinks he's dealing with "big data" doesn't mean he is in fact.