The crossword solution for the term 'TO BE, TO TIBERIUS' is 'ESSE'. This Latin verb means 'to be' and is derived from the Proto-Indo-European root *h₁es-. It is used in many languages, including English, Spanish, French, Italian, and German. The phrase 'TO BE, TO TIBERIUS' is a reference to the Roman Emperor Tiberius, who was known for his stoic philosophy and his famous quote 'I am content to be what I am'.