In meditation-speak, a flexible belief. The obvious derivation is as a counterweight to dogma, a fixed belief.
"Letting go. Don't expect anything, just say to yourself that you will embrace this meditation whatever may happen, the more you let go before, the more you will be able to let go during. So the current limiting dogma can be changed to the current new catma (= a relative, flexbile, temporary meta-belief or opinion which can be changed or improved upon at any time - and/or can be stored along with contradicting other catmas): New Catma: I don't need any expectations in meditation as they do not serve my best intrests (sic)." - dedroidify.blogspot.com