To decorate, adorn, or embellish something elaborately.
From Latin exornare, from ex- 'thoroughly' + ornare 'to adorn,' from ornus 'ash tree' (whose wood was prized). The prefix ex- intensifies the meaning of ornare.
The connection between 'ornate' and ash trees seems strange until you realize ancient Latin speakers saw the ash tree's graceful branches as naturally beautiful—so its wood symbolized elegant decoration!
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