The Collaborative International Dictionary of English v.0.48:

Stoic \Sto"ic\, n. [L. stoicus, Gr. ?, fr. ?, adj., literally,
   of or pertaining to a colonnade, from ? a roofed colonnade, a
   porch, especially, a porch in Athens where Zeno and his
   successors taught.]
   1. A disciple of the philosopher Zeno; one of a Greek sect
      which held that men should be free from passion, unmoved
      by joy or grief, and should submit without complaint to
      unavoidable necessity, by which all things are governed.
      [1913 Webster]

   2. Hence, a person not easily excited; an apathetic person;
      one who is apparently or professedly indifferent to
      pleasure or pain.
      [1913 Webster]

            A Stoic of the woods, a man without a tear.
                                                  --Campbell.
      [1913 Webster]

   School of Stoics. See The Porch, under Porch.
      [1913 Webster] Stoic

The Collaborative International Dictionary of English v.0.48:

Stoic \Sto"ic\, Stoical \Sto"ic*al\, a. [L. stoicus, Gr. ?: cf.
   F. sto["i]que. See Stoic, n.]
   1. Of or pertaining to the Stoics; resembling the Stoics or
      their doctrines.
      [1913 Webster]

   2. Not affected by passion; manifesting indifference to
      pleasure or pain; especially, bearing pain, suffering, or
      bad fortune without complaint. -- Sto"ic*al*ly, adv. --
      Sto"ic*al*ness, n.
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

stoic
    adj 1: seeming unaffected by pleasure or pain; impassive; "stoic
           courage"; "stoic patience"; "a stoical sufferer" [syn:
           stoic, stoical]
    2: pertaining to Stoicism or its followers
    n 1: a member of the ancient Greek school of philosophy founded
         by Zeno; "a Stoic achieves happiness by submission to
         destiny"
    2: someone who is seemingly indifferent to emotions [syn:
       stoic, unemotional person] [ant: emotional person]

Moby Thesaurus II by Grady Ward, 1.0:

115 Moby Thesaurus words for "stoic":
   Laodicean, Olympian, Spartan, accepting, aloof, apathetic,
   armed with patience, at rest, benumbed, blah, blase, bovine, calm,
   cloistered, comatose, cool, desensitized, detached, disciplined,
   disinterested, dispassionate, dull, dwindling, ebbing, endurant,
   enduring, even-tempered, even-tenored, forbearing, halcyon,
   heartless, hebetudinous, hopeless, hushed, impassive,
   imperturbable, in a stupor, indifferent, indulgent, inexcitable,
   inirritable, insouciant, isolated, languid, lenient, lethargic,
   listless, long-suffering, longanimous, man of iron, moldering,
   nonchalant, numb, numbed, pacific, passive, patient,
   patient as Job, peaceable, peaceful, persevering, philosophical,
   phlegmatic, placid, pluckless, quiescent, quiet, reposeful,
   reposing, resigned, restful, resting, secluded, self-controlled,
   sequestered, sequestrated, sheltered, slack, sluggish, smooth,
   soporific, spiritless, spunkless, steady, still, still as death,
   stillish, stilly, stolid, stupefied, subsiding, supine, tolerant,
   tolerating, tolerative, torpid, tranquil, unagitated, uncaring,
   unconcerned, understanding, undisturbable, undisturbed,
   unflappable, uninterested, unirritable, unmoved, unnervous,
   unpassionate, unperturbed, unruffled, unstirring, untroubled,
   waning, withdrawn



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

STring Oriented Interactive Compiler
STOIC

    (STOIC) A language from the Smithsonian
   Astrophysical Observatory.  STOIC is similar to FORTH for
   strings and includes many VAX-specific items.

   (1998-09-27)