The Collaborative International Dictionary of English v.0.48:

'Elan \['E]`lan"\, n. [F., fr. ['e]lancer to dart.]
   Ardor inspired by passion or enthusiasm.
   [1913 Webster]

WordNet (r) 3.0 (2006):

elan
    n 1: a feeling of strong eagerness (usually in favor of a person
         or cause); "they were imbued with a revolutionary ardor";
         "he felt a kind of religious zeal" [syn: ardor, ardour,
         elan, zeal]
    2: distinctive and stylish elegance; "he wooed her with the
       confident dash of a cavalry officer" [syn: dash, elan,
       flair, panache, style]
    3: enthusiastic and assured vigor and liveliness; "a performance
       of great elan and sophistication"

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "elan":
   activity, alacrity, animal spirits, animation, anxiety,
   anxiousness, appetite, ardor, avidity, avidness,
   breathless impatience, brio, briskness, capersomeness,
   cheerful readiness, coltishness, dash, eagerness, enthusiasm,
   esprit, exuberance, forwardness, friskiness, frolicsomeness,
   gaiety, gamesomeness, gayness, glow, gust, gusto, heartiness,
   impatience, impetuosity, impetus, joie de vivre, keen desire,
   keenness, life, liveliness, lustiness, mettle, oomph, perkiness,
   pertness, piss and vinegar, playfulness, promptness, quickness,
   readiness, robustness, rollicksomeness, rompishness, skittishness,
   spirit, spiritedness, spirits, sportiveness, sprightliness, verve,
   vigor, vim, vitality, vivacity, warmth, zest, zestfulness, zing,
   zip



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

ELAN
       Education LANguage


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

ELAN
       Emulated Local Area Network (ATM, LANE)


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

Elan

   ["Top-down Programming with Elan", C.H.A. Koster, Ellis
   Horwood 1987].