Theta

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Theta \The"ta\, n. [L., fr. Gr. qh^ta, the Greek letter [theta],
     [Theta].]
     A letter of the Greek alphabet corresponding to th in
     English; -- sometimes called the unlucky letter, from being
     used by the judges on their ballots in passing condemnation
     on a prisoner, it being the first letter of the Greek


     qa`natos, death.
     [1913 Webster]
  
     {Theta function} (Math.), one of a group of functions used in
        developing the properties of elliptic functions.
        [1913 Webster]

From WordNet (r) 2.0 [wn]:

  theta
       n : the 8th letter of the Greek alphabet