There is no single accepted universally accepted theory to explain the meaning of the term. One theory derives norito from noru (宣る, 'to declare'; cf. the verbs inoru 'to pray' and norou 'to curse') - combined with the suffix -to. A variant term, notto, is derived from a combination of norito with koto, 'word'.
There are various known ways of writing the word in kanji: aside from 祝詞 (currently the standard), 詔戸言, 詔刀言, and 諄辞 are also attested.
Norito were (and still are) traditionally written in a variety of man'yōgana where particles and suffixes are written in a smaller script than the main body of the text.  This style of writing, used in imperial edicts (宣命 senmyō) preserved in the Shoku Nihongi and other texts dating from the 8th century (Nara period), is known as senmyōgaki.