Ceremonial means used in or belonging to formal ceremonies. Ceremonial dress, a ceremonial sword, ceremonial duties.
It often carries the sense that the thing has no practical function left — a ceremonial role is one where the power has gone and the form remains, which is exactly what constitutional monarchy means. The Latin caerimonia named a religious rite.
1adjectiveceremonialUsed in or belonging to formal ceremonies.
“The soldiers wore ceremonial uniforms with red jackets for the parade.”
ceremonial is a quality of formality.
Latin caerimonialis comes from caerimonia, a religious rite or reverence; the further origin is uncertain.
Latin
caerimōniālis
Middle English
cerymonial
English, today
ceremonial
From Middle English cerymonial, from Latin caerimōniālis. Morphologically ceremony + al or -ial.
Etymology from Wiktionary, CC BY-SA