cardinal
Word family
- cardinallyadverbC1
- cardinalitynounC1
Synonym discussion
Sense: adjective/1
All four words describe something of great importance, but they differ in emphasis and usage. 'Cardinal' is the most formal and restricted — it nearly always appears before the noun in a set of fixed phrases (cardinal rule, cardinal sin, cardinal principle) and carries a sense of foundational gravity. 'Fundamental' focuses on forming the base or foundation of a system: 'a fundamental principle of democracy' implies everything else rests on it. 'Essential' stresses necessity — without it, something cannot function or succeed: 'essential safety equipment'. 'Vital' is more urgent and suggests life-or-death importance: 'vital information'. In everyday speech, 'essential' and 'fundamental' are far more common than 'cardinal'. A useful test: if you can naturally replace the word with 'basic' or 'foundational', choose 'fundamental'; if the context suggests 'extremely important but in a fixed expression', choose 'cardinal'.
Common collocations
Etymology
The word 'cardinal' comes from the Latin 'cardo', meaning 'hinge' or 'pivot'. In ancient Rome, a 'cardo' was the main street of a city (the north-south axis) from which all other streets branched. Something 'cardinal' was therefore 'on which something hinges' or 'of central importance'. The religious title developed because cardinals were the 'hinges' of the Church, supporting the Pope. The bird was named by early European settlers in North America who noticed its red colour matched the robes worn by Catholic cardinals.