solemn

the word 'solemn' carries a weight of tradition and ceremony from its ancient roots. it journeyed into english via old french from the latin 'sollemnis', a term describing rites and observances that were fixed by religious custom and therefore inviolable. this original sense of being formally and religiously established evolved to describe the grave and dignified character of such ceremonies. over time, the meaning broadened from describing the occasion itself to describing the serious and earnest demeanor appropriate to it, giving us the modern senses of both formal ceremony and sincere seriousness.

the word 'solemn' is a simplex form. it entered english as a whole unit from old french 'solempne', which derived from latin 'sollemnis' meaning 'established, religiously fixed, formal, ceremonial'. the latin root is of uncertain origin, though it may be related to 'solus' (whole, entire) or 'soleo' (to be accustomed).