η
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Translingual
Symbol
η
- (mathematics) The metric tensor in quantum field theory.
- (chemistry, physics) The coefficient of viscosity.
- (engineering) Efficiency in engineering.
- (physics) Sommerfeld parameter.
- (machine learning) Learning rate.
See also
Ancient Greek
Etymology
Derived from its majuscule counterpart Η, from the Phoenician letter 𐤇, heth.
Letter
η • (ē) (lowercase, uppercase Η)
- Lower-case eta, the seventh letter of the ancient Greek alphabet. Its name was ἦτα and it represented a long open-mid front unrounded vowel: /ɛː/. It is often transliterated as either e or i. It is preceded by ζ and followed by θ.
Derived terms
See also
- ἡ (hē, feminine article)
- ἥ (hḗ, feminine of pronoun ὅς)
- ᾖ (êi, inflectional form of verb εἰμί)
- (Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
- (non-Classical letters) Ϝ ϝ, Ͷ ͷ, Ͱ ͱ, Ϻ ϻ, Ϙ ϙ, Ͳ ͳ
- (punctuation) · ;
- (diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨
Greek
Pronunciation
- IPA(key): /i/ pronounced unstressed, together with its following word; compare to the stressed ή (í)
- Homophone: οι (oi)
Etymology 1
From the vocalic usage of the Ancient Greek letter.
Letter
η • (i) (lowercase, uppercase Η)
- Lower-case eta, the seventh letter of the modern Greek alphabet. Its name is ήτα and it represents a close front unrounded vowel: /i/. It is often transliterated as either e or i. It is preceded by ζ and followed by θ.
See also
- (Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
- (non-Classical letters) Ϝ ϝ, Ͷ ͷ, Ͱ ͱ, Ϻ ϻ, Ϙ ϙ, Ͳ ͳ
- (punctuation) · ;
- (diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨
Etymology 2
From Ancient Greek ἡ (hē).
Article
η • (i) f sg
- (definite) nominative feminine singular of ο (o) (the)
Declension
The definite article
| number | singular | plural | ||||
|---|---|---|---|---|---|---|
| gender | m | f | n | m | f | n |
| nominative | ο | η | το | οι | οι | τα |
| genitive | του | της | του | των | των | των |
| accusative | το(ν)* | τη(ν)* | το | τους | τις | τα |
| * The final "ν" is preserved before vowels, and the plosive/affricate consonants: κ, π, τ, ξ, ψ, μπ, ντ, γκ, τσ, τζ 1. Archaic forms used in certain fixed phrases: | ||||||