A verb appearing as G. felegra- or felcha- in the Gnomish Lexicon of the 1910s, based on G. feleg “equal” and glossed “equal (c. dat.)” (GL/34). The “c. dat.” probably means that the thing equaled is in the dative, e.g. “A [is] equal to B”.

Neo-Sindarin: Since I update G. feleg to ᴺS. bíleb “equal”, I would update this verb ᴺS. bilebra- “to be equal [to]”. I would further assume it requires a dative marker an as in A bilebra an B.