The definition of 25+80 is a mathematical equation that adds two numbers together. It is a basic addition problem that is often used to teach young children the fundamentals of mathematics. The equation is simple to solve, as it only requires the addition of two numbers. The answer to 25+80 is 105. This equation is often used to demonstrate the concept of addition, as it is a straightforward example of how two numbers can be added together. It is also used to help children understand the concept of carrying, as the equation requires the addition of two numbers that are in different place values. 25+80 is a great way to introduce children to the world of mathematics and to help them understand the basics of addition.