The crossword solution for the term 'OR GREATER' is PLUS, which is a four-letter word. PLUS is a mathematical operator that indicates addition or an increase in quantity. It is used to indicate that the number or value on the right side of the operator is greater than the number or value on the left side. For example, if the left side of the operator is 5 and the right side is 10, then the equation would be 5 10 = 15, indicating that 10 is greater than 5.