grasp

(noun) understanding of the nature or meaning or quality or magnitude of something. Synonyms: appreciation, hold. Examples: "He has a good grasp of accounting practices."

(noun) the limit of capability. Synonyms: compass, range, reach. Examples: "Within the compass of education."

(noun) an intellectual hold or understanding. Synonyms: grip. Examples: "A good grip on french history." "They kept a firm grip on the two top priorities." "He was in the grip of a powerful emotion." "A terrible power had her in its grasp."

(noun) the act of grasping. Synonyms: clasp, clench, clutch, clutches, grip, hold. Examples: "He released his clasp on my arm." "He has a strong grip for an old man." "She kept a firm hold on the railing."

(verb) hold firmly. Synonyms: hold on.

(verb) get the meaning of something. Synonyms: grok, get the picture, comprehend, savvy, dig, compass, apprehend. Examples: "Do you comprehend the meaning of this letter?."