A master piece is a work of art or literature that is considered to be of the highest quality. The term 'master piece' is often used to describe a work of art that has been created with great skill and creativity. In the context of a crossword puzzle, the solution for the term 'master piece' is 'PADLOCK', which is a device used to secure an object or area. Padlocks are typically made from metal and have a shackle that can be locked and unlocked with a key or combination.