Our mission is to make things prehensible, or understandable, to you. Whether you are physically reaching for a handle or mentally reaching for a concept, if it can be grasped, it’s prehensible.
If you're struggling to "get a grip" on the meaning of this word, think about a similar word: comprehensible. Both words describe things that can be understood, or comprehended. But prehensible isn't limited to mental comprehension; it has a foot in the physical world, too. So it could be used to describe a theory that you can understand, or it could refer to a rock that you can grasp while climbing a steep mountain face.