The term 'common denominator' is used to refer to a shared factor between two or more elements. In mathematics, it is the lowest number that can be divided into each of two or more numbers without leaving a remainder. In other contexts, it can refer to a shared trait or characteristic between two or more people, objects, or ideas. The crossword solutions for this term are LEAST (5 letters) and THEME (5 letters). LEAST refers to the lowest common denominator, which is the smallest number that can be divided into two or more numbers without leaving a remainder. THEME is related to the idea of a common denominator in that it refers to a unifying idea or concept that ties together multiple elements.