Is 'opaque context' the same as 'ambiguous sentence'?

No. Ambiguity is about a sentence having multiple possible meanings. An opaque context is about a specific grammatical/semantic environment where replacing one term with another term that refers to the same thing can change the truth of the whole statement.

Where would I encounter this term outside of philosophy?

In linguistics (semantics/pragmatics), in the theory of programming languages (for 'opaque data types' where internal structure is hidden), and occasionally in literary theory discussing unreliable narration.

What is the opposite of an opaque context?

A 'transparent context' or 'extensional context', where substitution of co-referential terms always preserves truth value (e.g., 'Superman flew' / 'Clark Kent flew').

Can you give a simple example of an opaque context?

'Alice knows that the Morning Star is a planet.' Even if 'the Morning Star' and 'the Evening Star' refer to the same object (Venus), substituting one for the other might make the sentence false if Alice doesn't know they are the same. The 'knows that...' part creates the opaque context.

opaque context

UK/əʊˈpeɪk ˈkɒn.tekst/US/oʊˈpeɪk ˈkɑːn.tekst/

Formal academic, technical

My Flashcards

Definition

Meaning

A linguistic or philosophical situation where substitution of co-referential terms changes truth value, making meaning or reference non-transparent.

Any situation where the relationship between elements is not clearly deducible from the surface structure, used in linguistics, philosophy, programming, and social sciences.

Linguistics

Semantic Notes

Primarily a term of art in philosophy of language and linguistics. It describes contexts where Leibniz's Law (substitutivity of identicals) fails because expressions create barriers to straightforward reference.

Dialectal Variation

British vs American Usage

Differences

No significant lexical differences; spelling follows national conventions ('analyse' vs 'analyze' in surrounding text).

Connotations

Identical technical meaning. Slight preference in UK for 'opaque construction' as a near-synonym in linguistics.

Frequency

Equally low-frequency in both dialects, confined to specialist discourse.

Vocabulary

Collocations

strong

create anin angives rise to anclassic example of an

medium

analysis ofproblem ofnotion ofdiscussion of

weak

highlysemanticallyphilosophically

Grammar

Valency Patterns

[verb] an opaque contextopaque context [preposition] [noun][adjective] opaque context

Vocabulary

Synonyms

Strong

intensional context

Neutral

referentially opaque contextnon-extensional context

Weak

ambiguous reference environmentnon-transparent construction

Vocabulary

Antonyms

transparent contextextensional contextreferentially transparent context

Phrases

Idioms & Phrases

“None (technical term)”

Usage

Context Usage

Business

Virtually never used.

Academic

Central in philosophy of language, semantics, formal logic; appears in linguistics and cognitive science papers.

Everyday

Extremely rare; if used, likely misunderstood.

Technical

Used in programming language theory (opaque data types) and formal semantics.

Examples

By Part of Speech

verb

British English

The modal operator 'believes' can opaque a context.
Negation may opacity the reference.

American English

The propositional attitude verb creates an opaque context.
Intensional operators opacity the surrounding context.

Examples

By CEFR Level

In philosophy, an 'opaque context' is a complicated idea about words and meaning.
The phrase 'believes that' often creates an opaque context.

Quine's famous example of 'Giorgione' illustrates the failure of substitutivity in an opaque context created by the attitude verb 'believes'.
Linguists distinguish between referentially transparent and opaque contexts when analysing propositional attitude reports.

Learning

Memory Aids

Mnemonic

Think of a frosted glass window (opaque) – you know someone is behind it, but you can't directly see or refer to them by name from the outside. The 'context' is the frosted glass.

Conceptual Metaphor

MEANING IS SEEING / REFERENCE IS A PATH (an opaque context is a barrier on the path from word to referent).

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

Do not translate 'opaque' as 'непрозрачный' in a physical sense only; the term is 'непрозрачный контекст' or 'опакный контекст' in specialised literature.
Avoid confusing with 'ambiguous context' ('неоднозначный контекст'), which is related but distinct.

Common Mistakes

Using it to mean simply 'confusing' or 'unclear situation' in general language.
Pronouncing 'opaque' as /ˈɒp.eɪk/ instead of /əʊˈpeɪk/.
Treating it as a compound noun with variable stress (it's usually 'opaque CONTEXT').

Practice

Quiz

Fill in the gap

In the sentence 'Lois Lane believes Superman can fly', the clause following 'believes' creates an context, so we cannot substitute 'Clark Kent' for 'Superman' without potentially changing the truth value.

Multiple Choice

Which of the following is MOST LIKELY to create an opaque context?

FAQ

Frequently Asked Questions

: No. Ambiguity is about a sentence having multiple possible meanings. An opaque context is about a specific grammatical/semantic environment where replacing one term with another term that refers to the same thing can change the truth of the whole statement.
: In linguistics (semantics/pragmatics), in the theory of programming languages (for 'opaque data types' where internal structure is hidden), and occasionally in literary theory discussing unreliable narration.
: A 'transparent context' or 'extensional context', where substitution of co-referential terms always preserves truth value (e.g., 'Superman flew' / 'Clark Kent flew').
: 'Alice knows that the Morning Star is a planet.' Even if 'the Morning Star' and 'the Evening Star' refer to the same object (Venus), substituting one for the other might make the sentence false if Alice doesn't know they are the same. The 'knows that...' part creates the opaque context.