η

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η U+03B7, η
GREEK SMALL LETTER ETA
ζ
[U+03B6]
Greek and Coptic θ
[U+03B8]
𝜂 U+1D702, 𝜂
MATHEMATICAL ITALIC SMALL ETA
𝜁
[U+1D701]
Mathematical Alphanumeric Symbols 𝜃
[U+1D703]

Translingual[edit]

Symbol[edit]

η

  1. (mathematics) The metric tensor in quantum field theory.
  2. (chemistry, physics) The coefficient of viscosity.
  3. (engineering) Efficiency in engineering.
  4. (physics) Sommerfeld parameter.
  5. (machine learning) Learning rate.

See also[edit]

Ancient Greek[edit]

Etymology[edit]

Derived from its majuscule counterpart Η, from the Phoenician letter 𐤇, heth.

Letter[edit]

η (ē) (lowercase, uppercase Η)

  1. 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[edit]

See also[edit]

Greek[edit]

Pronunciation[edit]

Etymology 1[edit]

From the vocalic usage of the Ancient Greek letter.

Letter[edit]

η (i) (lowercase, uppercase Η)

  1. 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[edit]

Etymology 2[edit]

From Ancient Greek ().

Article[edit]

η (if sg

  1. (definite) nominative feminine singular of ο (o) (the)
Declension[edit]