The crossword solutions for the term 'A IS ONE' are 'ARTICLE' (7 letters) and 'MARK' (4 letters). An ARTICLE is a type of writing that is usually found in newspapers, magazines, or online. It is typically written by a journalist or expert on a particular topic and is meant to inform readers about a certain subject. A MARK is a symbol or sign that is used to indicate something. It can be used to show ownership, to indicate a location, or to signify an event.