Meaning

• A decorative border around a picture used to inset and center the contents of a frame.

  "The image is a perfect square of 8 cm (with white matte border the total dimensions are 14 cm tall by 11 cm wide)."

• A background, often painted or created with computers

  "Matte painting is a tool that filmmakers can use to create a scene that is impossible to achieve with conventional cinematographic means."

• (pyrometallurgy) The molten metal sulfide phases typically formed during smelting of copper, nickel, and other base metals.

Meaning

• Dull; not reflective of light.

  "Flat or matte paint allows a deep color expression on the walls while also hiding flaws that may be inherent on the painted surface."