The term "modified" means to change or alter something in some way, typically making it different from its original form. It can refer to a physical change, such as modifying an automobile by adding aftermarket parts, or a more subtle change like modifying one's behavior to be more polite. The word is often used when discussing scientific experiments where variables are manipulated in order to observe the effects on an outcome. In essence, "modified" implies that something has been altered from its original state and may not necessarily imply a negative connotation.