The standard form of Cornish is for use in education and public life
A standard written form of Cornish has been agreed after two years work.
Members of the Cornish Language Partnership have voted to ratify the written form for use in education and public life.
Previously there were four different forms of spelling in Cornish but increasing use of the language led to calls for it to be standardised.
The Cornish Language Partnership said the agreement marked a significant stepping stone in the Cornish language.
The new standard spelling form will be reviewed in 2013.
It was agreed with members of the Cornish language community and linguists from other language communities.
Eric Brooke, chairman of the Cornish Language Partnership, said: "This marks a significant stepping-stone in the development of the Cornish language.
"In time this step will allow the Cornish language to move forward to become part of the lives of all in Cornwall."