núna (noun): success, victory, good fortune; luck, coincidence.
ta núna-r ratti ullínengá
NEG chance-SOC you.PL meet.PERF.RECIP
“you have not met by chance”
As in the example above, the noun núna often appears in the form núnar (sociative or genitive), with the meaning “coincidentally, by chance, with no discernible cause”.