|Native speakers||~12 million (2015)|
|Writing system||Terminian script|
|Official language in||Czisilia|
|Regulated by||Holy Academy of Linguistics|
Czisilian or Czisil (cissum tr. Čissum [ˈt͡ʃɪs.sʉm]) is a Milevic language spoken natively by about 12 million speakers, almost exclusively in Czisilia. It is related to other Milevic languages such as Farmoshi, Kaiseni and Lhidian. Czisilian was first standardised in the early 1800s by the Terminian Institute for the Languages of the Far East, which introduced a uniform standard of spelling and pronunciation.