Cache/kæʃ/ Definition 1 of 3Pro Tip 1/3Physical Hiding Refers to physical objects often hidden for protection or privacy. Pirates historically left a cache of treasures on remote islands. Pro Tip 2/3Metaphorical Use Can describe knowledge or information someone keeps to themselves. He had a cache of unwritten stories in his mind. Pro Tip 3/3Not Always Valuable While often valuable, a cache isn't inherently precious. The attic held a cache of old newspapers.