To decorate.
To add to.
The articles used in church services.
A characteristic that has a decorative function (typically in order to attract a mate)
A musical flourish that is unnecessary to the overall melodic or harmonic line, but serves to decorate that line.
An element of decoration; that which embellishes or adorns.
A Christmas tree decoration.
To become simpler.
To make simpler, either by reducing in complexity, reducing to component parts, or making easier to understand.