# tensor
## English
### Etymology

Borrowed from New Latin tensor (“that which stretches”), equivalent to tense +‎ -or. Anatomical sense from 1704. Introduced in the 1840s by William Rowan Hamilton as an algebraic quantity unrelated to the modern notion of tensor. The contemporary mathematical meaning was introduced (as German Tensor) by Woldemar Voigt (1898) and adopted in English from 1915 (in the context of general relativity), obscuring the earlier Hamiltonian sense. The mathematical object is so named because an early application of tensors was the study of materials stretching under tension. (See, for example, Cauchy stress tensor on Wikipedia.Wikipedia )

### Pronunciation

* (Received Pronunciation) IPA: /ˈtɛn.sə/, /ˈtɛn.sɔː/
* Audio (Southern England):(file)
* (General American) IPA: /ˈtɛn.sɚ/, /ˈtɛn.sɔɹ/
* Rhymes: -ɛnsə(ɹ)

### Noun

tensor (plural tensors or (muscle) tensores)
* (anatomy) A muscle that tightens or stretches a part, or renders it tense. [from 17th c.]
    Hyponyms: tensor fasciae latae, tensor tympani, tensor veli palatini
* (mathematics, linear algebra, physics) A mathematical object that describes linear relations on scalars, vectors, matrices and other algebraic objects, and is represented as a multidimensional array. [from 18th c.]
    Hypernym: function
    Hyponyms: duotensor, eigentensor, Faraday tensor, hypertensor, metric tensor, pseudotensor, subtensor, supertensor, vector, Weyl tensor, zero tensor
** 1963, Richard Feynman, “Chapter 31, Tensors”, in The Feynman Lectures on Physics, volume II:The tensor $\alpha _{ij}$ should really be called a “tensor of second rank,” because it has two indexes. A vector—with one index—is a tensor of the first rank, and a scalar—with no index—is a tensor of zero rank.
** (engineering) A multidimensional array with (at least) two dimensions.
* (mathematics, obsolete) A norm operation on the quaternion algebra.

#### Usage notes

(mathematics, linear algebra):
* The array's dimensionality (number of indices needed to label a component) is called its order (also degree or rank).
** In engineering usage the term is commonly used only for ranks of 2 (or more), contrasted with scalar and vectors.
* Tensors operate in the context of a vector space and thus within a choice of basis vectors, but, because they express relationships between vectors, must be independent of any given choice of basis. This independence takes the form of a law of covariant and/or contravariant transformation that relates the arrays computed in different bases. The precise form of the transformation law determines the type (or valence) of the tensor. The tensor type is a pair of natural numbers (n, m), where n is the number of contravariant indices and m the number of covariant indices. The total order of the tensor is the sum n + m.

#### Derived terms

* tensor algebra
* tensor field
* tensorial
* tensor operator
* tensor product
* tonic tensor tympani syndrome

#### Translations
### Verb

tensor (third-person singular simple present tensors, present participle tensoring, simple past and past participle tensored)
* To compute the tensor product of two tensors or algebraic structures.

### References

* “tensor”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
* “tensor”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
* ↑ W. Voigt, Die fundamentalen physikalischen Eigenschaften der Krystalle in elementarer Darstellung, Leipzig, Germany: Veit & Co., 1898, p. 20.
* ↑ Rowland, Todd and Weisstein, Eric W., "Tensor", Wolfram MathWorld.

### Anagrams

* noters, tenors, sterno-, Trones, nestor, Stoner, Treons, rest on, trones, Sterno, Nortes, toners, Reston, Nestor, stoner, -setron

## Dutch
### Etymology

Ultimately or directly from Latin tensor.

### Pronunciation

* IPA: /ˈtɛn.zɔr/, /ˈtɛn.sɔr/
* Audio:(file)
* Hyphenation: ten‧sor
* Rhymes: -ɛnzɔr

### Noun

tensor m (plural tensoren)
* (mathematics, linear algebra) tensor

#### Derived terms

* tensoralgebra

## Latin
### Etymology

From tendō (“stretch, distend, extend”) +‎ -tor (agent suffix).

### Pronunciation

* (Classical Latin) IPA: /ˈten.sor/, [ˈt̪ẽːs̠ɔr]
* (modern Italianate Ecclesiastical) IPA: /ˈten.sor/, [ˈt̪ɛnsor]

### Noun

tensor m (genitive tensōris); third declension (New Latin)
* that which stretches

#### Inflection

Third-declension noun.

#### Descendants

* → English: tensor

## Polish
### Etymology

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

### Pronunciation

* IPA: /ˈtɛn.sɔr/
* Audio:(file)
* Rhymes: -ɛnsɔr
* Syllabification: ten‧sor

### Noun

tensor m inan (related adjective tensorowy)
* (mathematics, physics) tensor

#### Declension
### Further reading

* tensor in Polish dictionaries at PWN

## Portuguese
### Etymology

Borrowed from French tenseur.

### Pronunciation

* (Brazil) IPA: /tẽˈsoʁ/ [tẽˈsoh]
* (Brazil) IPA: /tẽˈsoʁ/ [tẽˈsoh]
** (São Paulo) IPA: /tẽˈsoɾ/
** (Rio de Janeiro) IPA: /tẽˈsoʁ/ [tẽˈsoχ]
** (Southern Brazil) IPA: /tẽˈsoɻ/
* (Portugal) IPA: /tẽˈsoɾ/
* (Portugal) IPA: /tẽˈsoɾ/
** (Southern Portugal) IPA: /tẽˈso.ɾi/
* Rhymes: (Portugal, São Paulo) -oɾ, (Brazil) -oʁ
* Hyphenation: ten‧sor

### Adjective

tensor (feminine tensora, masculine plural tensores, feminine plural tensoras)
* tensing; tensile

### Noun

tensor m (plural tensores)
* (mathematics) tensor

### References

* ↑ “tensor”, in Dicionário Priberam da Língua Portuguesa (in Portuguese), Lisbon: Priberam, 2008–2025

## Romanian
### Etymology

Borrowed from French tenseur or German Tensor.

### Noun

tensor m (plural tensori)
* (mathematics) tensor

#### Declension
## Spanish
### Pronunciation

* IPA: /tenˈsoɾ/ [t̪ẽnˈsoɾ]
* Rhymes: -oɾ
* Syllabification: ten‧sor

### Adjective

tensor (feminine tensora, masculine plural tensores, feminine plural tensoras)
* tensing; tensile

### Noun

tensor m (plural tensores)
* tensor

#### Derived terms

* tensor del tímpano
* tensor métrico

### Further reading

* “tensor”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8, Royal Spanish Academy [Spanish: Real Academia Española], 2024 December 10

## Swedish
### Noun

tensor c
* (mathematics) tensor; a function which is linear in all variables

#### Declension

| | | nominative | genitive |
| singular | indefinite | tensor | tensors |
| singular | definite | tensorn | tensorns |
| plural | indefinite | tensorer | tensorers |
| plural | definite | tensorerna | tensorernas |

### Anagrams

* noters, ortens, rosten, rotens, sorten, toners