"Wear" is actually the correct term. The flash cells that make up an SSD can only be written a limited number of times so they do "wear". For cheaper consumer grade SSDs it's around 1000 cycles. "Wear levelling" is an important feature - different cells are written to spread the wear more evenly, extending the life of the drive.
AnandTech | Samsung SSD 840: Testing the Endurance of TLC NAND