What does centrality mean?
Centrality is the quality of lying at, or belonging to, the centre of something — whether literally, as a point positioned in the middle of a space, or figuratively, as an idea or institution regarded as essential to a larger whole. When scholars write about the centrality of religion to medieval life or the centrality of the family in a novelist's work, they are asserting not merely location but fundamental importance. The word carries a formal register and appears most often in academic, political, and analytical writing rather than casual conversation. It has also taken on a specialised technical meaning in network science, where various measures of centrality quantify how influential a node is within a graph. Derived from the Latin centrum, meaning the point of a circle from which all radii are equally distant, centrality remains a compact way of naming whatever sits at the very heart of a matter.
The quality or state of being central, either literally in terms of physical position or figuratively in terms of fundamental importance within a context, system, or field of study.
"Marxist historians emphasised the centrality of class struggle in shaping modern European history."
Typically used in formal or academic registers; often paired with 'of' and 'to' to specify both what is central and what domain it is central to.
(network analysis) Any of several numerical measures quantifying the relative structural importance or influence of a node within a graph.
"PageRank is one well-known measure of node centrality used by search engines to rank web pages."
Technical usage specific to graph theory, sociology, and computer science; usually qualified by the type of measure, e.g., degree centrality, betweenness centrality, eigenvector centrality.
Rare outside technical contexts. In network analysis, the plural refers collectively to multiple different centrality measures or to centrality scores across nodes. In ordinary usage, the word is almost always treated as uncountable.
"Different centralities can rank the same network's nodes in strikingly different orders."
Network scientists have turned this abstract noun into hard numbers — there are at least four different mathematical ways to measure just how 'central' you are.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of centrality
Centrality derives from the Latin 'centralis', formed from 'centrum' meaning the centre or midpoint of a circle, which itself was borrowed into Latin from Greek 'kentron', meaning a sharp point or the stationary point of a compass. The adjective 'central' entered English via French in the sixteenth century, and the abstract noun 'centrality' followed in the seventeenth century, following the productive English pattern of forming abstract nouns with '-ity'. Its cognates include 'concentrate', 'eccentric', and 'egocentric', all built on the same Greek root for point or pivot.
Related word forms
How centrality is actually used
A formal, largely academic word common in scholarly writing, sociology, political theory, and network science. It frequently appears with the prepositions 'of' and 'to' ('the centrality of X to Y'). In mathematics and computer science it has acquired a precise technical meaning that differs from the everyday figurative use.
Easily confused with centrality
In graph theory, 'centrality' refers specifically to a measure of how important a node is within a network, such as 'betweenness centrality', whereas the everyday sense refers to general importance or being at the centre.