The Collaborative International Dictionary of English v.0.48:

Grasp \Grasp\, v. t. [imp. & p. p. Grasper; p. pr. & vb. n.
   Qraspine.] [OE. graspen; prob. akin to LG. grupsen, or to
   E. grope. Cf. Grab, Grope.]
   1. To seize and hold by clasping or embracing with the
      fingers or arms; to catch to take possession of.
      [1913 Webster]

            Thy hand is made to grasp a palmer's staff. --Shak.
      [1913 Webster]

   2. To lay hold of with the mind; to become thoroughly
      acquainted or conversant with; to comprehend.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Grasp \Grasp\, v. i.
   To effect a grasp; to make the motion of grasping; to clutch;
   to struggle; to strive.
   [1913 Webster]

         As one that grasped And tugged for life and was by
         strength subdued.                        --Shak.
   [1913 Webster]

   To grasp at, to catch at; to try to seize; as, Alexander
      grasped at universal empire,
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Grasp \Grasp\, n.
   1. A gripe or seizure of the hand; a seizure by embrace, or
      infolding in the arms. "The grasps of love." --Shak.
      [1913 Webster]

   2. Reach of the arms; hence, the power of seizing and
      holding; as, it was beyond his grasp.
      [1913 Webster]

   3. Forcible possession; hold.
      [1913 Webster]

            The whole space that's in the tyrant's grasp.
                                                  --Shak.
      [1913 Webster]

   4. Wide-reaching power of intellect to comprehend subjects
      and hold them under survey.
      [1913 Webster]

            The foremost minds of the next . . . era were not,
            in power of grasp, equal to their predecessors. --Z.
                                                  Taylor.
      [1913 Webster]

   5. The handle of a sword or of an oar.
      [1913 Webster]

WordNet (r) 3.0 (2006):

grasp
    n 1: understanding of the nature or meaning or quality or
         magnitude of something; "he has a good grasp of accounting
         practices" [syn: appreciation, grasp, hold]
    2: the limit of capability; "within the compass of education"
       [syn: compass, range, reach, grasp]
    3: an intellectual hold or understanding; "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" [syn: grip, grasp]
    4: the act of grasping; "he released his clasp on my arm"; "he
       has a strong grip for an old man"; "she kept a firm hold on
       the railing" [syn: clasp, clench, clutch, clutches,
       grasp, grip, hold]
    v 1: hold firmly [syn: grasp, hold on]
    2: get the meaning of something; "Do you comprehend the meaning
       of this letter?" [syn: grok, get the picture,
       comprehend, savvy, dig, grasp, compass,
       apprehend]

Moby Thesaurus II by Grady Ward, 1.0:

165 Moby Thesaurus words for "grasp":
   abduct, absorb, accept, adhere, adhere to, agglomerate, appreciate,
   apprehend, apprehension, assimilate, awareness, be acquainted with,
   be apprised of, be aware of, be cognizant of, be conscious of,
   be conversant with, be informed, be with one, bear hug, bite,
   bunch, carry off, catch, catch on, clairvoyance, clamp, clasp,
   claws, cleave, cleave to, clench, clinch, cling, cling to,
   clinging, clip, clot, cluster, clutch, clutches, coagulate,
   cognize, cohere, command, compass, comprehend, comprehension,
   conceive, conception, conceptualization, conceptualize, congeal,
   conglomerate, control, death grip, dig, digest, discern,
   domination, dominion, embrace, envisage, fathom, firm hold, follow,
   foothold, footing, foreknowledge, freeze to, get, get hold of,
   get the drift, get the idea, get the picture, grab, grapple, grip,
   gripe, grow together, haft, hand, handle, hands, hang on,
   hang on to, hang together, have, have information about,
   have it taped, have knowledge of, helm, helve, hold, hold fast,
   hold on, hold on to, hold tight, hold together, hug, ideation,
   intellection, intelligence, iron grip, iron hand, jurisdiction,
   keep hold of, ken, kidnap, know, learn, lock, make out, mass,
   master, mastership, mastery, mental grasp, nab, never let go, nip,
   perceive, perception, persist, possess, possession, power,
   precognition, prehend, prehension, purchase, read, realize,
   recognize, reins of government, savvy, see, seize,
   seize the meaning, seizure, sense, set, shanghai, snatch, solidify,
   sovereignty, stay, stay put, stick, stick to, stick together,
   suzerainty, take, take hold of, take in, talons, tenure, throttle,
   tight grip, toehold, understand, understanding, wisdom, wot,
   wot of



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

GRASP
       Graphic Animation System for Professionals