This is David's Definitions for the July issue of Community News.
This is commonly misused to mean "really, really big." "He was amazed by the enormity of the mountains." That is incorrect. Enormity does come from the same Latin root as enormous, but the two words drifted apart long ago. Enormity came to mean something extraordinarily evil or immoral or shocking. So you can speak of the enormity of a crime (meaning its awfulness, not its magnitude). Or you could refer to a major social transgression, such as behaving very badly at a very formal event, as a social enormity, although that meaning is somewhat old fashioned. If you simply want to say that something is really, really big, then talk about its hugeness or its immensity or its enormousness, but not its enormity.