The Collaborative International Dictionary of English v.0.48:

Cubicle \Cu"bi*cle\ (k?"b?-k'l), n. [L. cubiculum.]
   A loding room; esp., a sleeping place partitioned off from a
   large dormitory.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cubicle
    n 1: small room in which a monk or nun lives [syn: cell,
         cubicle]
    2: small individual study area in a library [syn: carrel,
       carrell, cubicle, stall]
    3: small area set off by walls for special use [syn: booth,
       cubicle, stall, kiosk]

Moby Thesaurus II by Grady Ward, 1.0:

22 Moby Thesaurus words for "cubicle":
   alcove, bay, bedchamber, bedroom, boudoir, carrel, chamber, corner,
   cove, cranny, cubby, cubbyhole, cubiculum, dormitory, niche, nook,
   nursery, oriel, recess, roomlet, sleeping room, snuggery