η

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η U+03B7, η
GREEK SMALL LETTER ETA
ζ
Greek and Coptic θ

Translingual

Symbol

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.
  6. (UPA) a velar nasal (IPA ŋ).

See also

Ancient Greek

Etymology

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

Letter

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

See also

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)

  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

Etymology 2

From Ancient Greek ().

Article

η (if sg

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