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:

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.
kosmu
x1 (abstraction) is a purpose/use of x2 (object or event), attributed by x3