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The Castithan language, known as Castithan or Kastíthanu, is spoken by the Castithan people in the series Defiance.

Real-World Context[]

The language was created by David J. Peterson for the series.


Labial Dental Alveolar Postalveolar Palatal Guttural
Nasal m n ɲ(ny) ŋ(ng)
Plosive/Affricate p, b t, d tʃ(ch), dʒ(j) k, g
Fricative f, v θ(th), ð(dh) s ʃ(sh) h
Approximant (w) ɾ(r) j w
Lateral approximant l ʎ(ly)

Front non-Front
High i u
Mid e(e) ɔ(o)
Low ɐ/ɑ(a)

In old versions of Castithan, there used to be long vowels.


The language's syllable structure is (C)V(C). Stress is generally on the first syllable, but can appear on any of the first three syllables of a root.

Writing System[]

The language uses an abugida called Fajizwalino.[1]


Castithan is topic-prominent, and is pro-drop, despite lacking agreement. Other features include a cessative aspect and a complex politeness system with many honorifics.


Castithan uses a base-20, or vigesimal number system.