Meaning

• An element of decoration; that which embellishes or adorns.

• A Christmas tree decoration.

• A musical flourish that is unnecessary to the overall melodic or harmonic line, but serves to decorate or "ornament" that line.

• (in the plural) The articles used in church services.

• A characteristic that has a decorative function (typically in order to attract a mate)

Meaning

• To decorate.

  "We will ornament the windows with trim to make the room seem brighter."

• To add to.

  "The editor ornamented his plain writing, making it fancier but less clear."