Maybe in encyclopedias? Imagine an entry like that:
A new love
What's a new love? Love is a warm feeling you can have towards somebody. If you are in love, you like that person very much. Love can always feel different. A love is new when you feel a different love, a love you have never felt before. Love can also stand for a person. So a new love can also mean that someone has a new boyfriend or girlfriend.
Sentence structures like "a XY is Z" is very typical of encyclopedias.