The term 'minimal in magnitude' can be described as 'LEAST' which is a 5 letter word. This term is used to describe something that is the smallest or lowest in amount, size, or degree. It is often used to refer to the smallest possible amount of something, such as the LEAST amount of effort or the LEAST amount of time. It can also be used to describe the smallest possible difference between two things, such as the LEAST amount of change in temperature.