Short for “ middle-distance relationship ,” an MDR is when two people find themselves living with *JUST* enough distance between them that they can’t see each other as often as they'd like — shorter than the distance between Taylor Swift and Adele's vocal ranges but longer than the time it takes to master the catchy lyrics to Tay Tay ’s latest chart-topper. Commonly used for a relationship with a significant other, friend, or friend's pet that lives more than 30 minutes, one bridge or a very large hill away.