What does externalise mean?
To externalise is to move something from within to without — whether that something is a feeling, a thought, or a cost. In psychology and everyday speech, people externalise emotions by expressing them through words, art, or behaviour rather than keeping them hidden. In economics, the term takes on a sharper edge: firms are said to externalise costs when they shift burdens like pollution or health impacts onto society rather than bearing them themselves. The word also has a philosophical use, describing how we project inner experiences onto the outside world as though they had independent existence there. Spelled with an -ise ending in British English and -ize in American English, externalise belongs to a formal register and appears frequently in academic writing, therapy, journalism about business practices, and discussions of social responsibility. Its usefulness lies in naming a transfer — making visible what was private, or making others pay for what you caused.
verbTo express or manifest thoughts, feelings, or inner states in outward, observable form; more broadly, to shift costs, problems, or responsibilities onto an outside party such as society or the environment.
- (psychology) To give outward expression to internal thoughts, feelings, or conflicts.
- (economics) To transfer costs or negative consequences to parties outside a transaction, such as society or the environment.
- (general) To treat something abstract as if it existed externally; to objectify.
"Therapy helped him externalise the anxieties he had kept bottled up for years."
"Writing in her journal allowed her to externalise emotions she couldn't voice aloud."
"Critics argue that polluting industries externalise their costs onto taxpayers and future generations."
Economists call it 'externalising' when a factory makes everyone else breathe its smoke — and it's the same word therapists use when you finally say out loud what you've been bottling up.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of externalise
Externalise derives from "external", which entered English via Latin externus, meaning "outward" or "outside", itself formed from exter, "outside of". The verb was formed by adding the suffix -ise (from French -iser, ultimately Greek -izein), on the model of verbs like internalise and realise. It developed in the nineteenth century alongside the growth of psychological and philosophical vocabulary, later acquiring its economic sense as economists formalised the notion of externalities.
Related word forms
How externalise is actually used
"Externalise" is chiefly British spelling; American usage prefers "externalize". The word is common in psychology, psychoanalysis, and economics, and carries a somewhat formal register. In everyday British English "express" is often preferred except in technical contexts.
Easily confused with externalise
Internalise means to absorb ideas or norms into one's own thinking, whereas externalise means to push them outward into observable form.
Externality is a noun denoting a side effect imposed on others (chiefly in economics), while externalise is the verb describing the act of producing such effects.