1. any two places or regions that are on diametrically opposite sides of the earth 2. something that is the exact opposite or contrary of another
A friend at work asked me if the word dichotomy would be appropriate in a certain context, and I suggested antipodes instead. Bill Bryson, in his book In a Sunburned Country, uses antipodean six times, enough for me to instantly recall it two years after having read the book when the situation called for it.