How many letters does the top answer for “using or knowing three languages” have?

The most common answer is trilingual (10 letters).

Crossword clue: using or knowing three languages

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

trilingual 10 letters wn-def

using or knowing three languages

using or knowing two languages 60% similar → bilingual

using or knowing more than one language 50% similar → multilingual

using or knowing only one language 50% similar → monolingual