What does externalist mean?
An externalist is a person who endorses externalism, most prominently in philosophy, where it names the view that mental content, meaning, or epistemic justification depends in part on factors beyond the individual's own mind — the surrounding world, environment, or social context. Where internalists locate knowledge and thought wholly within the head, the externalist insists that what a person believes and how those beliefs are justified cannot be understood apart from their circumstances. In epistemology this yields views like reliabilism, on which a belief's warrant turns on the reliability of the process producing it. Outside philosophy, the word occasionally labels anyone who explains events mainly through outward conditions rather than inner dynamics. The term is technical and formal, encountered chiefly in academic writing and debate, and pairs naturally with its counterpart "internalist," which marks the opposing camp in one of modern philosophy's central disputes about the nature of mind and knowledge.
nounA person who adheres to externalism, the philosophical doctrine that mental content, justification, or meaning depends partly on factors outside the mind. More broadly, anyone who explains a phenomenon primarily in terms of external rather than internal causes.
- A philosopher or thinker who subscribes to externalism, especially the view that mental states or justification depend on factors outside the subject's mind.
- More generally, someone who accounts for a phenomenon chiefly by reference to external conditions or forces rather than internal ones.
"As an externalist, she argued that the meaning of our thoughts is fixed by the environment we inhabit, not by what goes on inside our heads."
"The externalist contends that whether a belief counts as knowledge can depend on facts the believer may be unaware of."
"An economic externalist might explain the firm's decline through market forces rather than its internal culture."
Regular plural, used when referring to multiple adherents of externalism, typically within discussions of philosophical positions and debates.
"Externalists and internalists have debated the nature of justification for decades."
In philosophy's long debate over the mind, an externalist takes the provocative stance that your thoughts aren't entirely yours — part of what you mean lives out in the world.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of externalist
Externalist derives from "external," borrowed in the Middle Ages from Latin "externus," meaning outward or belonging to the outside, itself rooted in the comparative form "externus" from Latin "exter" (on the outside). The noun formed with the agent suffix -ist, which English took via Greek-derived -istes and French -iste, denotes an adherent of a position. It arose alongside "externalism" as philosophers formalized the debate over whether mental content and justification depend on factors outside the subject, becoming common terminology in twentieth-century analytic philosophy.
Related word forms
How externalist is actually used
"Externalist" belongs primarily to academic and technical discourse — epistemology, philosophy of mind, and philosophy of language — and would sound out of place in casual conversation. It carries no strong connotation of praise or blame; it simply signals allegiance to a position in a scholarly debate. The extended, non-philosophical sense (explaining things by external causes) is rarer and often ad hoc.
Easily confused with externalist
Externalism is the doctrine itself, while an externalist is a person who holds or advocates that doctrine.
Extrinsic describes properties originating outside a thing, whereas externalist names a person who favors explanations appealing to outside factors.