The term ARITHMETIC TERM is composed of three crossword solutions: SUMS (4 letters), SUM (3 letters), and LCD (3 letters). SUMS stands for 'SUM of a Series of Numbers, ' which is a mathematical operation that adds up all the numbers in a sequence. SUM is an abbreviation for 'SUMMATION, ' which is the process of adding up two or more numbers. Lastly, LCD stands for 'Least Common Denominator, ' which is the smallest number that can be divided evenly by two or more other numbers.