from The Century Dictionary and Cyclopedia
- Self-regulated; consisting of self-governing members: an epithet of those convents of the Greek Church in which each member of the community is left to regulate his own manner of life. Also written idiorhythmic.
Sorry, no etymologies found.
This may be one reason why, even among the ruling monasteries of Mount Athos, the idiorrhythmic (individualized) rule has been set aside in favor of the more deeply traditional coenobitic (community) rule -- the fathers 'lives in Christ are necessarily lives together.