Definition of theta in English:

theta

Line breaks: theta
Pronunciation: /ˈθiːtə
 
/

noun

1The eighth letter of the Greek alphabet (Θ, θ), transliterated as ‘th’.
More example sentences
  • English borrowed the digraph th from Latin, where it served to transliterate Greek theta; th superseded other symbols for the dental fricative following the advent of printing.
  • Look lower down the alphabet - theta perhaps, or even upsilon.
  • With these basic relationships in mind, let's now take a closer look at time value and the rate of time-value decay (represented by theta, from the Greek alphabet).
1.1 (Theta) [followed by Latin genitive] Astronomy The eighth star in a constellation: Theta Draconis
More example sentences
  • It is 4.8° SSW of Theta Aurigae.
  • Some of Ara's stars are very distant: both Gamma Arae and Theta Arae lie more than 1,000 light years away, but both of these stars are brilliant supergiants, and so are clearly visible to the naked eye of an observer on Earth.
1.2 [as modifier] Chemistry Denoting a temperature at which a polymer solution behaves ideally as regards its osmotic pressure.
More example sentences
  • For a given star polymer the theta temperature can be lower or higher than that of the corresponding linear polymer depending on the number and length of its branches.
  • We use equations derived from the blob theory to calculate the blob size and the theta temperature of star polymers.

symbol

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1 (θ) Temperature (especially in degrees Celsius).
1.1 (θ) A plane angle.
1.2 (θ) A polar coordinate. Often coupled with φ (phi).

Origin

Greek.

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