Osthoff's law
E520892
Osthoff's law is a sound change in Indo-European linguistics describing the shortening of long vowels before resonant consonants followed by another consonant.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Osthoff's law canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5460641 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Osthoff's law Context triple: [Indo-European phonology, studies, Osthoff's law]
-
A.
Lusser's law
Lusser's law is a reliability engineering principle that states the overall reliability of a system is the product of the reliabilities of its individual components, highlighting how system reliability decreases as more components are added in series.
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B.
Kluge's law
Kluge's law is a proposed sound law in Proto-Germanic historical linguistics that explains the development of certain geminate consonants from earlier consonant clusters.
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C.
Aitken’s Law
Aitken’s Law is a phonological rule in Scots and Scottish English that governs when vowels are pronounced long or short depending on their phonetic and morphological environment.
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D.
Ottenstein
Ottenstein is a district (Ortsteil) of the town of Ahaus in the state of North Rhine-Westphalia, Germany.
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E.
Laporte rule
The Laporte rule is a selection rule in spectroscopy that states electronic transitions in centrosymmetric molecules or ions are only allowed between states of opposite parity, helping explain the intensity patterns of absorption and emission spectra.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Osthoff's law Target entity description: Osthoff's law is a sound change in Indo-European linguistics describing the shortening of long vowels before resonant consonants followed by another consonant.
-
A.
Lusser's law
Lusser's law is a reliability engineering principle that states the overall reliability of a system is the product of the reliabilities of its individual components, highlighting how system reliability decreases as more components are added in series.
-
B.
Kluge's law
Kluge's law is a proposed sound law in Proto-Germanic historical linguistics that explains the development of certain geminate consonants from earlier consonant clusters.
-
C.
Aitken’s Law
Aitken’s Law is a phonological rule in Scots and Scottish English that governs when vowels are pronounced long or short depending on their phonetic and morphological environment.
-
D.
Ottenstein
Ottenstein is a district (Ortsteil) of the town of Ahaus in the state of North Rhine-Westphalia, Germany.
-
E.
Laporte rule
The Laporte rule is a selection rule in spectroscopy that states electronic transitions in centrosymmetric molecules or ions are only allowed between states of opposite parity, helping explain the intensity patterns of absorption and emission spectra.
- F. None of above. chosen
Statements (26)
| Predicate | Object |
|---|---|
| instanceOf |
historical sound change
ⓘ
phonological rule ⓘ sound law ⓘ |
| affects | long vowels ⓘ |
| appliesTo | Proto-Indo-European NERFINISHED ⓘ |
| concerns | interaction of vowel length and syllable structure ⓘ |
| condition | resonant followed by another consonant (RC) cluster ⓘ |
| controversies | scope and exact formulation in different Indo-European branches ⓘ |
| describes | shortening of long vowels before resonant consonants followed by another consonant ⓘ |
| discoveredBy | Hermann Osthoff NERFINISHED ⓘ |
| environment | before resonant consonant plus another consonant ⓘ |
| field | Indo-European linguistics ⓘ |
| hasConcept | compensatory shortening ⓘ |
| involves | vowel shortening ⓘ |
| namedAfter | Hermann Osthoff NERFINISHED ⓘ |
| operatesOn | syllable nucleus ⓘ |
| relatedTo |
Brugmann's law
NERFINISHED
ⓘ
Sievers' law NERFINISHED ⓘ |
| relevantTo |
Balto-Slavic historical phonology
ⓘ
Greek historical phonology ⓘ Indo-Iranian historical phonology NERFINISHED ⓘ |
| statusInLinguistics | widely discussed ⓘ |
| timeOfFormulation | late 19th century ⓘ |
| typeOfChange | quantitative vowel change ⓘ |
| usedFor |
explaining vowel length alternations
ⓘ
reconstruction of Proto-Indo-European forms ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Osthoff's law Description of subject: Osthoff's law is a sound change in Indo-European linguistics describing the shortening of long vowels before resonant consonants followed by another consonant.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.