What does cardinal mean?
Cardinal functions as both a noun and an adjective, carrying meanings that all trace back to the idea of something essential or pivotal. As a noun, it refers primarily to one of the senior princes of the Roman Catholic Church, appointed by the Pope and collectively responsible for electing his successor; it also names a strikingly red-crested songbird native to North America, so called for its resemblance to the prelates' scarlet vestments. As an adjective, cardinal denotes something of supreme importance or foundational significance, as in a cardinal rule or a cardinal virtue — a usage rooted in the word's Latin ancestor cardo, meaning hinge. In mathematics, cardinal numbers express quantity, answering how many as opposed to ordinal numbers, which express position. The adjective form tends toward formal register, appearing most often in established phrases, while the noun senses are common in religious and ornithological contexts alike.
A leading dignitary of the Roman Catholic Church, appointed by the Pope and normally belonging to the Sacred College responsible for electing new popes.
"After the pope's death, cardinals from around the world traveled to Rome for the conclave."
In this sense cardinal is often used attributively before a name, as in Cardinal Newman.
A crested North American finch (Cardinalis cardinalis), the male of which is distinguished by its brilliant scarlet plumage.
"A northern cardinal perched at the snowy feeder, its red feathers startling against the white."
Of the highest importance; serving as the foundation or pivot on which something depends.
"Punctuality was a cardinal requirement of the job."
Relating to cardinal numbers, which denote quantity rather than position.
"Children learn cardinal counting before they grasp ordinal concepts."
The plural applies to both noun senses: church officials and the birds.
"The cardinals voted over several days before white smoke rose from the chimney."
The word 'cardinal' comes from Latin 'cardo', meaning hinge — the idea being that cardinals are the hinges on which the Church turns, just as cardinal virtues are the hinges of a good life.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cardinal
Cardinal derives from the Latin cardinalis, meaning principal or chief, which itself stems from cardo, meaning hinge — the pivot point on which a door turns, hence anything fundamental. The ecclesiastical title arose because these clerics were regarded as the hinges upon which the Church turned, and the term entered English via Old French in the medieval period. The same Latin root cardo gives English words such as cordial (originally from cor, heart, though related through a different branch) and, more distantly through Greek kardia, cardiac terms like cardiovascular. The North American bird acquired its name from its vivid red plumage, echoing the traditional scarlet dress of Catholic cardinals.
Related word forms
How cardinal is actually used
As an adjective, cardinal appears almost exclusively in formal or elevated registers, most often in fixed phrases such as 'cardinal rule', 'cardinal sin', and 'cardinal virtues'. The bird sense is chiefly North American; the species' name derives from the resemblance of the male's red plumage to the scarlet robes worn by Catholic cardinals.
Easily confused with cardinal
Cordial means warm and friendly or a sweet liqueur, whereas cardinal means chief or of fundamental importance.