The term 'MUSKETEER MOTTO WORD' is a crossword solution that refers to the three-letter word 'ALL'. This word is part of the famous motto of the Musketeers, a group of fictional swashbuckling heroes from Alexandre Dumas' novel The Three Musketeers. The full motto is 'All for one, and one for all'. This phrase has become a popular expression of solidarity and unity, and is often used to describe a situation in which people work together for a common goal.