1. To correctly depict three-dimensional space on a flat surface, as in artwork. That box in the background of your painting doesn't look like it's in perspective to me.

2. To have an awareness of something's true value, importance, or significance. Wow, my petty gripes and problems are really in perspective now that I've seen the devastation that hurricane caused. It's not in perspective for her—she doesn't realize that each of us will get 10 years in prison if we're caught.