What does cogency mean?
Cogency is the quality of being clear, logical, and convincing — the force that makes an argument difficult to refute. A speech, essay, or piece of evidence has cogency when its reasoning holds together tightly and compels assent from the listener or reader. The word is most often used in formal contexts: philosophy, law, science, and serious journalism, where arguments are weighed for their strength as much as their content. To say that someone argued 'with great cogency' is to praise both the clarity and the persuasive power of what they said. Cogency differs subtly from mere logic: a chain of reasoning can be technically valid yet fail to persuade if it is muddled or poorly expressed, whereas a cogent argument combines sound reasoning with lucid delivery. Its opposite is incoherence or feebleness of argument. For writers and speakers who want to be believed, cogency is among the highest compliments their work can receive.
nounThe quality of being clear, logical, and convincing; the power of an argument or statement to compel belief through its force and coherence.
- The quality or force of an argument, reasoning, or statement in being clear, logically compelling, and persuasive.
- (Less common) The general quality of being forceful and effective in expression.
"The lawyer's argument carried such cogency that the jury was persuaded within minutes."
"The philosopher's essay is admired for the cogency of its reasoning."
"She dismantled his proposal with remarkable cogency, exposing each flaw in turn."
Rarely pluralized; the word is almost always used in singular form when referring to the quality of an argument.
"The cogencies of their respective arguments were impossible to compare directly."
Cogency comes from the Latin 'cogere' — literally 'to drive together' — so a cogent argument is one that drives scattered thoughts into a single, irresistible point.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cogency
Cogency derives from Latin 'cogentia', from 'cogens', the present participle of 'cogere', meaning 'to drive together, compel'. This verb combines 'co-' (together) with 'agere' (to drive). English adopted the word in the early 17th century alongside the adjective 'cogent'. It shares its root with words like 'act' and 'agent', all stemming ultimately from the Latin 'agere'.
Related word forms
How cogency is actually used
Cogency is a somewhat formal, intellectual word, most at home in academic writing, legal discourse, and serious criticism. It carries a positive connotation, implying not just correctness but persuasive power. It applies primarily to arguments, reasoning, and evidence rather than to people themselves.
Easily confused with cogency
Coherence refers to internal logical consistency and connectedness, while cogency emphasizes the overall power of an argument to convince.
'Cogence' is a rare or obsolete variant spelling; 'cogency' is the standard modern form.