As nouns the difference between rogation and rigation
is that rogation is a deeply serious and somber prayer or entreaty while rigation is irrigation.
rogation
English
Noun
(
en noun)
A deeply serious and somber prayer or entreaty.
* Hooker
- He perfecteth the rogations or litanies before in use.
(historical, Roman antiquity) The demand, by the consuls or tribunes, of a law to be passed by the people; a proposed law or decree.