(historical) The lowest social class of citizens in ancient Athens.

Obsolete form of thither.

Of or relating to Thetis

Laid down; absolute or positive, like a law.

plural of thetine

(chemistry) Any of a series of complex basic sulphur compounds analogous to the sulphines.

(mathematics) Any of a group of special functions of several complex variables, important in many areas, including the theories of abelian varieties and moduli spaces, and of quadratic forms.

plural of theta function

(grammar, especially transformational grammar) Abbreviation of thematic role.

plural of theta role