The crossword solution for the term 'To Be, In Marseilles' is 'ETRE', which is the French verb meaning 'to be'. This verb is used in many languages, including French, Spanish, and Portuguese. It is also used in English in certain contexts, such as when talking about a person's identity or occupation. In French, it is conjugated differently depending on the subject pronoun, and is used to express existence, identity, or location.