The Collaborative International Dictionary of English v.0.48:

Hap \Hap\ (h[a^]p), v. t. [OE. happen.]
   To clothe; to wrap.
   [1913 Webster]

         The surgeon happed her up carefully.     --Dr. J.
                                                  Brown.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hap \Hap\, n. [Cf. Hap to clothe.]
   A cloak or plaid. [O. Eng. & Scot.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hap \Hap\, n. [Icel. happ unexpected good luck. [root]39.]
   That which happens or comes suddenly or unexpectedly; also,
   the manner of occurrence or taking place; chance; fortune;
   accident; casual event; fate; luck; lot. --Chaucer.
   [1913 Webster]

         Whether art it was or heedless hap.      --Spenser.
   [1913 Webster]

         Cursed be good haps, and cursed be they that build
         Their hopes on haps.                     --Sir P.
                                                  Sidney.
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         Loving goes by haps:
         Some Cupid kills with arrows, some with traps. --Shak.
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The Collaborative International Dictionary of English v.0.48:

Hap \Hap\, v. i. [OE. happen. See Hap chance, and cf.
   Happen.]
   To happen; to befall; to chance. --Chaucer.
   [1913 Webster]

         Sends word of all that haps in Tyre.     --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hap
    n 1: an accidental happening; "he recorded all the little haps
         and mishaps of his life"
    v 1: come to pass; "What is happening?"; "The meeting took place
         off without an incidence"; "Nothing occurred that seemed
         important" [syn: happen, hap, go on, pass off,
         occur, pass, fall out, come about, take place]

Moby Thesaurus II by Grady Ward, 1.0:

97 Moby Thesaurus words for "hap":
   accident, accidentality, actuarial calculation, adventitiousness,
   adventure, be found, be met with, be realized, bechance, befall,
   betide, break, bundle up, casualness, casualty, chance, chance hit,
   circumstance, come, come about, come along, come down, come off,
   come to pass, come true, contingency, contingent, destiny, develop,
   episode, event, eventuate, experience, fact, fall, fate, fluke,
   flukiness, fortuitousness, fortuity, fortune, freak accident,
   gamble, go, go off, good fortune, good luck, happen, happen along,
   happen by chance, happening, happenstance, happy chance, hazard,
   heedless hap, how they fall, incident, indeterminacy,
   indeterminateness, law of averages, long odds, long shot, lot,
   luck, lucky shot, matter of fact, moira, muffle, occasion, occur,
   occurrence, opportunity, particular, pass, pass off, phenomenon,
   pop up, portion, principle of indeterminacy, probability,
   problematicness, random sample, reality, risk, run of luck,
   serendipity, statistical probability, take place, the breaks,
   theory of probability, transpire, turn of events, turn up,
   uncertainty, uncertainty principle, whatever comes, wrap up



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

HAP
       Host Access Protocol (RFC 907/1221)


Bouvier's Law Dictionary, Revised 6th Ed (1856):

HAP. An old word which signifies to catch; as, "to hap the rent," to hap the
deed poll." Techn. Dict. h.t.