The Collaborative International Dictionary of English v.0.48:

Chasm \Chasm\ (k[a^]z'm), n. [L. chasma, Gr. cha`sma, fr.
   chai`nein to gape, to open wide. See Chaos.]
   1. A deep opening made by disruption, as a breach in the
      earth or a rock; a yawning abyss; a cleft; a fissure.
      [1913 Webster]

            That deep, romantic chasm which slanted down the
            green hill.                           --Coleridge.
      [1913 Webster]

   2. A void space; a gap or break, as in ranks of men.
      [1913 Webster]

            Memory . . . fills up the chasms of thought.
                                                  --Addison.
      [1913 Webster]

WordNet (r) 3.0 (2006):

chasm
    n 1: a deep opening in the earth's surface

Moby Thesaurus II by Grady Ward, 1.0:

115 Moby Thesaurus words for "chasm":
   abysm, abyss, aperture, arroyo, blank, box canyon, breach, break,
   broaching, canyon, cavity, chap, check, chimney, chink, clearing,
   cleavage, cleft, cleuch, clough, clove, col, coulee, couloir,
   crack, cranny, crater, crevasse, crevice, cut, cwm, deep, defile,
   dell, depth, dig, diggings, dike, disclosure, ditch, donga, draw,
   excavation, fault, fenestra, fissure, fistula, flaw, flume,
   fontanel, foramen, fracture, furrow, gap, gape, gash, gat, gorge,
   groove, gulch, gulf, gully, hiatus, hole, hollow, incision, inlet,
   interval, joint, kloof, lacuna, laying open, leak, mine, moat,
   notch, nullah, opening, opening up, orifice, outlet, overlook,
   oversight, pass, passage, passageway, pit, pore, preterition,
   quarry, ravine, rent, rift, rime, rupture, scissure, seam, shaft,
   skip, slit, slot, space, split, stoma, throwing open, trench,
   uncorking, unstopping, valley, void, wadi, well, workings, yawn,
   yawning abyss



The Free On-line Dictionary of Computing (30 December 2018):

CHeap ASseMbler
CHASM

    (CHASM) A shareware assembler for MS-DOS.

   (1994-11-15)