Definition of "ornament"

Dust are our frames; and, gilded dust, our pride / Looks only for a moment whole and sound; / Like that long-buried body of the king / Found lying with his urns and ornaments, / Which at a touch of light, an air of heaven, / Slipt into ashes and was found no more.

1864, Alfred Tennyson, “Aylmer’s Field”, in Enoch Arden, &c., London: Edward Moxon & Co., […], page 51

I'm a bit short on brain myself; the old bean would appear to have been constructed more for ornament than for use.

1919, P. G. Wodehouse, My Man Jeeves

Drawings and pictures are more than mere ornaments in scientific discourse. Blackboard sketches, geological maps, diagrams of molecular structure, astronomical photographs, MRI images, the many varieties of statistical charts and graphs: These pictorial devices are indispensable tools for presenting evidence, for explaining a theory, for telling a story.

2012 March, Brian Hayes, “Pixels or Perish”, in American Scientist‎, volume 100, number 2, archived from the original on 19 February 2013, page 106

Not a scene goes by that hasn't been ornamented with a split screen, a freeze frame, a caption, a voice-over, a switch between monochrome and colour, or a change of the aspect radio[sic].

2021 July 12, Nicholas Barber, “The French Dispatch: Four stars for Wes Anderson's latest”, in BBC‎