ordo
UK[ˈɔːdəʊ]US[ˈɔːrdoʊ]
n
A term used in historical contexts, particularly in ancient Rome, to refer to a social class or order, such as the senatorial or equestrian order.
n
In Christian liturgy, a book containing the rites and ceremonies for the celebration of Mass or other sacraments.
n
In taxonomy, a category in the biological classification ranking below class and above family.
Etymology
The English term 'ordo' is a direct borrowing from Latin, where 'ōrdō' (genitive 'ōrdinis') signified a row, line, sequence, or social rank. This Latin word is believed to derive from the Proto-Indo-European root h₂er- meaning "to fit, to join," which also gave rise to Latin 'artus' (joint) and 'ars' (art, skill), reflecting a foundational concept of orderly arrangement. In English, 'ordo' retains its classical sense of a structured class or rank, most famously in the phrase "Senatus Populusque Romanus" where the 'populus' was divided into 'ordines.' Its specialized adoption into Christian liturgy for a book of rites and into biological taxonomy for a classification level directly extends this core idea of a prescribed, hierarchical system.
Analysis
The word 'ordo' is a simplex loanword directly from Latin. It does not contain separable morphemes in its modern English spelling. In Latin, it functioned as a noun meaning "row, series, rank, or arrangement."
Examples
The Roman citizenry was divided into several distinct ordines based on wealth and status.
The priest consulted the ordo to confirm the proper prayers for the feast day.
The lion belongs to the ordo Carnivora within the class Mammalia.