The term GRASP MENTALLY can be seen in a crossword puzzle as three separate solutions: SEE (3 letters), GRASP (5 letters), and MENTALLY (8 letters). SEE is a verb meaning to perceive with the eyes or to understand. GRASP is a verb meaning to take hold of or to comprehend. MENTALLY is an adverb meaning in the mind or intellectually. Together, the term GRASP MENTALLY means to understand something intellectually or to comprehend something in the mind.