What does theorise mean?
To theorise means to form or put forward a theory: a systematic account or explanation of something. A theorise may be supported by evidence and designed for testing, as in scientific research, or it may be an informal conjecture about what might explain a situation. The word therefore occupies both an academic and an everyday register. In careful scholarly writing, it describes the intellectual work of developing explanations from observations. In more conversational or critical contexts, it can imply that an idea is plausible but unproved. People may theorise about why an event occurred, how a historical process developed, or what will happen next. The word is especially common in British English and in other varieties that commonly use the suffix -ise; American English generally spells it theorize. Distinguishing theorising from guessing is important: a theory need not be true, but it should provide a coherent explanation that can be examined against evidence.
verbTo develop or propose a theory, especially as an explanation of a phenomenon or set of facts. It can also mean to speculate informally about what might be true or likely.
- To develop or propose a theory about something.
- To speculate about a possibility without firm evidence.
"Researchers theorise that the unusual behaviour results from changes in the animal's habitat."
"Historians have long theorised about the causes of the collapse."
"We can theorise about the future, but only evidence can tell us what is likely to happen."
To theorise is to look for an explanation: the word ultimately evokes the Greek idea of observing and examining something carefully.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does theorise come from?
The word comes through Latin from Greek theorētos, meaning “theoretical” or “perceptible,” and ultimately from Greek theoros, meaning “spectator” or “one who looks.” The Greek element theor- is also the source of theorem, theory, theoretical and theorist. Modern theorise developed as a verb meaning to form a theory or express something hypothetically, with the spelling theorise standard in British English.
Related word forms
How theorise is actually used
The word is formal and academic in most contexts. In everyday discussion it can sometimes sound dismissive, suggesting that an explanation is speculative and has not been tested or demonstrated.
Easily confused with theorise
Theorise and theorize are the British and American spellings of the same verb.