dunliki fu'ivla

Something is such that both x1 and x2 are related to it by predicate x3. x4 [quantifier] thing to which x1 is related by predicate x3 is such that x2 is related to it by predicate x3.

The first definition is equivalent to the second definition with lo ka ce'u ce'u kancusu'oi in x4. See dunli, ckini, me'au, dunlixu, dunlija, dunlini, .utka

In notes:

x1 and x2 both satisfy predicate x3
x1 and x2 satisfy predicate x3 to the same extent
Either both x1 and x2, or neither x1 nor x2, satisfy predicate x3