Explanation
A presupposition is background content that an utterance does not present as its main new assertion but treats as already given for the current use. “Mara has stopped smoking” does not foreground her earlier smoking, yet that assumption normally remains under negation or questioning. Triggers include particular verbs, definite descriptions, focus particles, and constructions. Interlocutors may silently add an unfamiliar background assumption—a process called accommodation—or explicitly reject it. Presupposition therefore shows how language structures shared reality not only through asserted additions but through less visible conditions on what counts as already established. Precisely because such content occupies the background, it can influence an exchange without receiving the same immediate scrutiny as its foregrounded claim.
Movement of thought
1. An utterance carries content without presenting it as the principal assertion. 2. A linguistic trigger marks this background as already available for the exchange. 3. Negation, questioning, or modality tests whether the assumption remains comparatively stable. 4. Addressees accommodate, correct, or refuse the presupposed content. 5. The utterance returns as a conjunction of visible claim and tacit model of the shared world.
Scientific use case
Experiments can measure projection, accommodation, and rejection across different triggers. Conversation corpora reveal when presupposed content is silently accepted, explicitly corrected, or strategically challenged.
Example
“Jonas also read the report” asserts Jonas's reading while treating at least one other reader as given. A response can reject precisely that background assumption.
Counterexample
“Mara does not smoke” directly asserts non-smoking and does not presuppose that she smoked before. Not every inference supplied by world knowledge is therefore a linguistically triggered presupposition.
Distinction
Distinguish presupposition from assertion, implicature, and logical entailment. Assertion supplies the main at-issue contribution, implicatures are typically more cancellable, and not every entailed fact is treated as already given.
Effect on thought and perception
Presuppositions move content into the background and thereby influence what an exchange presents as settled, available, or self-evident.
Resonance
A second layer sounds beneath the stated claim; it supports understanding until an interlocutor interrupts the ground on which it rests.
Cite this entry
Reich, Michael (Hrsg./ed.): „Presupposition“. Atlas der Sprache, AT-PRA-0003. ATLAS 260, data model 1.6.0. https://atlasoflanguage.com/concept/AT-PRA-0003The address remains stable; editorial content may evolve. Editorial reading state: 2026-10-15. Include your access date for precise references.
Historical background
Jespersen distinguishes adjuncts that delimit the intended referent from non-restrictive adjuncts that describe an already identified referent. His relative-clause examples show how similar wording can serve different informational functions. Page 112 was checked in the scan and the following passage read in OCR. This is a historical comparison for presupposition, not a presupposition theory: supplementary content, assumed background, and asserted content do not automatically coincide. It does not establish the lexical histories of the German and English terms.
How conceptual history changes the analysis
Assess each content separately as asserted, supplementary, or presupposed. Projection under negation and questions is a present-day diagnostic, not a claim documented in this Jespersen passage.
References for the historical section
- Otto Jespersen, The Philosophy of Grammar, work first published 1924; inspected later printing with November 1934 afterword, exact printing year unresolved · Chapter VIII, restrictive and non-restrictive adjuncts, printed pp. 112–113
Selected historical witness, not a complete genealogy or a first English attestation. Atlas comparisons and applications are original editorial interpretations. OCR of a later printing containing a 1934 afterword. The catalogue’s 1924 date identifies the work’s first publication, not the inspected copy. Historical judgments about languages and social groups require critical distance.