The Collaborative International Dictionary of English v.0.48:

Vim \Vim\, n. [L., accusative of vis strength.]
   Power; force; energy; spirit; activity; vigor. [Colloq.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

vim
    n 1: a healthy capacity for vigorous activity; "jogging works
         off my excess energy"; "he seemed full of vim and vigor"
         [syn: energy, vim, vitality]
    2: an imaginative lively style (especially style of writing);
       "his writing conveys great energy"; "a remarkable muscularity
       of style" [syn: energy, muscularity, vigor, vigour,
       vim]

Moby Thesaurus II by Grady Ward, 1.0:

122 Moby Thesaurus words for "vim":
   aggressiveness, amperage, animal spirits, animation, armipotence,
   authority, bang, beef, black power, breeziness, brio, briskness,
   brute force, bubbliness, capersomeness, charge, charisma, clout,
   cogence, cogency, coltishness, compulsion, dash, dint, drive,
   duress, ebullience, effect, effectiveness, effectuality,
   effervescence, elan, energy, enterprise, esprit, exuberance, fire,
   flower power, force, force majeure, forcefulness, friskiness,
   frolicsomeness, full blast, full force, gaiety, gamesomeness,
   gayness, get-up-and-go, ginger, gusto, heartiness, influence,
   initiative, kick, life, liveliness, main force, main strength,
   mana, might, might and main, mightiness, moxie, muscle power,
   oomph, pep, pepper, peppiness, piss and vinegar, pizzazz,
   playfulness, poop, potence, potency, potentiality, power,
   power pack, power structure, power struggle, powerfulness,
   prepotency, productiveness, productivity, puissance, pull, punch,
   push, rollicksomeness, rompishness, sinew, skittishness, snap,
   spirit, spiritedness, spirits, sportiveness, sprightliness, spunk,
   starch, steam, strength, strong arm, superiority, superpower,
   thrust, validity, vehemence, verve, vigor, virility, virtue,
   virulence, vitality, vivaciousness, vivacity, wattage, weight,
   zest, zestfulness, zing, zip



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

VIM
       Vendor Independent Messaging (Lotus, Borland, IBM, Novell, API)


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

VIM
       VI Improved (VI, Unix)


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

VIM

   1.  Vendor Independent Messaging.

   2.  Vi Improved.

   (1999-06-15)