erpi fu'ivla

x1 (abstraction) is the purpose of x2 (object or event)

See terpli, terzu'e, terfi'i. Syn. kosmu. Note that this is not a mere short-form; this word is agent-less. (≈ te pilno be fi zi'o)

In notes:

kosmu
x1 (abstraction) is a purpose/use of x2 (object or event), attributed by x3
terfi'i
x1 (abstraction) is the purpose of x2 (object) by creator/inventor x3, inspired by x4
terpli
x1 (abstraction) is the purpose of x2, used by x3
terzu'e
z3 is the purpose of action z2 by agent z1.