What exactly does it mean? Is it ethnicity/race only? Is a predominantly white school "diverse" if these kids speak and indentify with a culture other than "mainstream Canadian/American" culture at home? What about socio-economic class?

I'd say that roughly 15 to 20% of the students at the school I attended as a teenager are boarders from foreign countries. Most are what Canadians would call "visible minorities". Plenty of "day girls" (students who go home at the end of the day) are also visible minorities. Yet, I'd say that the overwhelming majority of these kids are from upper middle class households. Is it still diverse? The "visible minorities" in this school tend also to be from certain ethnicities. The majority of visible minorities at this school (at least at the time I was going there) were Chinese (next biggest group would probably be South Asian...mostly Indian). If the students at this school were either Chinese or white (mostly WASP), is it still diverse? Diverse, because there ARE visible minorities (people who aren't "with it" in the private school community seem to believe that prep schools are very, very WASPy...maybe culturally (I know a few Asians who are more culturally British than some white British people!), but not in cultures? Religiously speaking, most of the students would probably identify as some sort of Christian, but not necessarily the same denomination. Does this mean that the school is "religiously diverse"? Or do they have to have a lot of non-Christians to qualify? And the kids. Some are tall, some are short. Sine are fat, some are skinny. Many are in between. The school has an elementary division as well as middle school and high school. So I guess age wise, yes, it's diverse. But what about other things?