Abbreviations 101: i.e., vs. e.g.,
Saturday, September 11th, 2010For all you lovers of all things short (and I’m referring to language, not to those under 5′3″, such as yours truly), here’s a short-but-oh-so-sweet entry about two abbreviations that are often confused with each other.
i.e., = in other words. OK, really it means id est (which roughly translates to that is) in Latin. Always (always!) use a comma after the second period and, yes, always use both periods (i.e.,). Use i.e., for anything that may need to be expanded upon in a slightly different way in order for your meaning to be clear:
- My dog (i.e., the fur ball who sleeps in the crook of my knee) needs a bath.
- That chocolate cake (i.e., the one to the left — not to the right — of the cookies) tastes great with raspberry sauce drizzled on it.
- Your friend (i.e., the flight attendant with the bouffant hairdo) gave me two bags of peanuts.
The words following i.e., are alternate descriptions of the thing that comes before i.e., and are not simply examples of the early word(s). In the third example, I specify which friend of yours I am referring to; I am not assuming that you only have one friend but that you have this one particular friend to whom I am referring.

We loved eating the fresh gelato (e.g., tiramisu, white chocolate, blueberry swirl) in Italy (i.e., Venice and Rome) (photo: http://www.flickr.com/photos/cote/4163592189/sizes/m/in/photostream/)
e.g., = for example. In Latin, that’s exempli gratia. Use e.g., (again, always with the periods and always with the comma) when you’re expanding your explanation with an example, rather than an alternate or more-defined description:
- I love just about every kind of ice cream (e.g., chocolate peanut butter, coffee, vanilla bean, banana chocolate, raspberry, mocha) that has ever been created.
- Do you like Italian food (e.g., Insalata Caprese, rigatoni, gelato)?
- Running can be difficult (e.g., going into the wind, running with blisters, jogging in high humidity).
The words following e.g., are examples of the thing that comes before e.g., and are not suggesting any sort of limitation. For example (oy!), there are many Italian dishes, but I mentioned only three foods as examples of Italian food.
One way to remember the difference between the two is that e.g., sounds like example, and i.e., and in other words both start with the letter i.
Or you could just memorize which is which and be done with it. Good times.
Happy trails!
SAK

