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third dimension the dimension of depth or volume, as distinguished from the two dimensions provided on a plane surface. [2 definitions]
Third International an international Communist organization founded in Moscow in 1919 to unite all national Communist groups and advocate the spread of Communism.
third party a political party formed in dissension from or opposition to the major parties in a two-party system. [2 definitions]
third person in grammar, the category of pronouns, inflections, and the like that indicates one that is neither the speaker of a sentence nor one to whom the speaker is speaking, but rather, a person or thing that the speaker is speaking about. [3 definitions]
third rail an added rail that carries the electric current in an electric railway or subway.
third-rate of third rate, class, or the like. [2 definitions]
Third Reich Germany under Nazi rule, from 1933 to 1945; Nazi Germany.
Third Republic the republic of France from 1870 to 1940.
third stream a kind of music that combines jazz improvisation with classical forms.
Third World (often l.c.) the developing nations, as of Asia and Africa, esp. those not aligned with either of the two dominant political blocs.
thirst a feeling of dryness in the mouth or throat, associated with the need or desire to drink. [5 definitions]
thirsty experiencing thirst; needing to drink. [4 definitions]
thirteen the number represented by the Arabic numeral 13 and by the Roman numeral XIII. [3 definitions]
thirteenth indicating rank or position between twelfth and fourteenth. [3 definitions]
thirtieth indicating rank or position between twenty-ninth and thirty-first. [3 definitions]
thirty the number represented by the Arabic numeral 30 and by the Roman numeral XXX. [5 definitions]
Thirty Years' War a series of European wars occurring from 1618 to 1648, originally between German Catholics and German Protestants but later involving Sweden, France, and Spain, from which France emerged as the most powerful nation in Europe.
this the person, thing, or matter mentioned, understood, or at hand. [7 definitions]
thistle any of various plants with prickly leaves and showy heads of usu. purplish flowers.
thistledown the fluffy, seed-carrying down on the mature flower head of a thistle.