Noun
A system founded upon a ritual or prescribed form of religious worship; adherence to, or observance of, a ritual.
Specifically :(a) The principles and practices of those in the Church of England, who in the development of the Oxford movement, so-called, have insisted upon a return to the use in church services of the symbolic ornaments (altar cloths, encharistic vestments, candles, etc.) that were sanctioned in the second year of Edward VI., and never, as they maintain, forbidden by competennt authority, although generally disused. Schaff-Herzog Encyc. (b) Also, the principles and practices of those in the Protestant Episcopal Church who sympathize with this party in the Church of England.
Source: Webster's dictionaryThese adherents of ritualism, among whom were Percy Dearmer and others, claimed that the Ornaments Rubric prescribed the ritual usages of the Sarum Rite with the exception of a few minor things already abolished by the early reformation. Source: Internet
The ritualism belonged to Apollo from the beginning. Source: Internet