1.understanding of the nature or meaning or quality or magnitude of something;
he has a good grasp of accounting practices
2.the limit of capability;
within the compass of education
3.a firm controlling influence;
they kept a firm grip on the two top priorities
4.the act of grasping;
he released his clasp on my arm
1.hold firmly
2.get the meaning of something;
Do you comprehend the meaning of this letter?