The Collaborative International Dictionary of English v.0.48:

Moxie \Mox"ie\, n. [fr. Moxie, a trade name for a beverage.]
   1. energy; pep.
      [1913 Webster]

   2. courage, determination.
      [1913 Webster]

   3. Know-how, expertise. --MW10.
      [1913 Webster]

WordNet (r) 3.0 (2006):

moxie
    n 1: fortitude and determination; "he didn't have the guts to
         try it" [syn: backbone, grit, guts, moxie, sand,
         gumption]

Moby Thesaurus II by Grady Ward, 1.0:

109 Moby Thesaurus words for "moxie":
   amperage, animation, armipotence, authority, backbone, beef, birr,
   black power, bottom, breeziness, briskness, brute force,
   bubbliness, charge, charisma, clout, cogence, cogency, compulsion,
   courage, dauntlessness, dint, drive, duress, ebullience, effect,
   effectiveness, effectuality, effervescence, energy, flower power,
   force, force majeure, forcefulness, full blast, full force,
   gameness, go, grit, guts, hardihood, heart, influence,
   intestinal fortitude, life, liveliness, main force, main strength,
   mana, mettle, mettlesomeness, might, might and main, mightiness,
   muscle power, nerve, pep, peppiness, piss and vinegar, pith,
   pizzazz, pluck, pluckiness, poop, potence, potency, potentiality,
   power, power pack, power structure, power struggle, powerfulness,
   prepotency, productiveness, productivity, puissance, pull, punch,
   push, resolution, sand, sinew, spirit, spiritedness, sprightliness,
   spunk, spunkiness, stamina, steam, strength, strong arm,
   superiority, superpower, toughness, true grit, tuck, validity,
   vehemence, verve, vigor, vim, virility, virtue, virulence,
   vitality, vivaciousness, vivacity, wattage, weight



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

Moxie

    A language for real-time computer music
   synthesis, written in XPL.

   ["Moxie: A Language for Computer Music Performance",
   D. Collinge, Proc Intl Computer Music Conf, Computer Music
   Assoc 1984, pp.217-220].

   (1994-12-05)