vonfu'ivla lujvo

x1=v1=f1 is a stage 4 fu'ivla meaning x2=v2, based on word x3=f2 in language x4.

'stage 4 fu'ivla' is a term specific to Lojban and described in 'The Complete Lojban Language', chapter 4, section 7. The definition is similar to that of fu'ivla, but with the x3 place of fu'ivla omitted. x1 is assumed to be a word in Lojban as the concept doesn't make much sense for other languages. See also pavyfu'ivla - 'stage 1 fu'ivla', relfu'ivla - 'stage 2 fu'ivla' and cibyfu'ivla - 'stage 3 fu'ivla'

In notes:

cibyfu'ivla
x1=v1=f1 is a stage 3 fu'ivla meaning x2=v2, based on word x3=f2 in language x4.
fu'ivla
x1=v1=f1 is a loanword meaning x2=v2 in language x3=v3, based on word x4=f2 in language x5.
pavyfu'ivla
x1=v1=f1 is a stage 1 fu'ivla meaning x2=v2, based on word x3=f2 in language x4.
relfu'ivla
x1=v1=f1 is a stage 2 fu'ivla meaning x2=v2, based on word x3=f2 in language x4.
zi'evla
x1=v1=z1 is an irregular/free-form content word meaning x2=v2=z2 in language x3=v3 (usually Lojban); x1 is a stage-4 or stage-3 fu'ivla.