How many letters does the top answer for “sameness of signification of two or more propositions which differ in language.” have?

The most common answer is equipollence (12 letters).

Crossword clue: sameness of signification of two or more propositions which differ in language.

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

equipollence 12 letters web-def

Sameness of signification of two or more propositions which differ in language.

equipollency 12 letters web-def

Sameness of signification of two or more propositions which differ in language.