Source : Webster's Revised Unabridged Dictionary (1913)

Lark \Lark\, n. [Perh fr. AS. l[=a]c play, sport. Cf. {Lake}, v.
   i.]
   A frolic; a jolly time. [Colloq.] --Dickens.

Lark \Lark\, v. i.
   To catch larks; as, to go larking.

Lark \Lark\, v. i. [imp. & p. p. {Larked}; p. pr. & vb. n.
   {Larking}.]
   To sport; to frolic. [Colloq.]

Lark \Lark\, n. [OE. larke, laverock, AS. l[=a]werce; akin to D.
   leeuwerik, LG. lewerke, OHG. l?rahha, G. lerche, Sw.
   l["a]rka, Dan. lerke, Icel. l[ae]virki.] (Zo["o]l.)
   Any one numerous species of singing birds of the genus
   {Alauda} and allied genera (family {Alaudid[ae]}). They
   mostly belong to Europe, Asia, and Northern Africa. In
   America they are represented by the shore larks, or horned by
   the shore larks, or horned larks, of the genus {Otocoris}.
   The true larks have holaspidean tarsi, very long hind claws,
   and usually, dull, sandy brown colors.

   Note: The European skylark, or lark of the poets ({Alauda
         arvensis}), is of a brown mottled color, and is noted
         for its clear and sweet song, uttered as it rises and
         descends almost perpendicularly in the air. It is
         considered a table delicacy, and immense numbers are
         killed for the markets. Other well-known European
         species are the crested, or tufted, lark ({Alauda
         cristata}), and the wood lark ({A. arborea}). The
         pipits, or titlarks, of the genus {Anthus} (family
         {Motacillid[ae]}) are often called larks. See {Pipit}.
         The American meadow larks, of the genus {Sturnella},
         are allied to the starlings. See {Meadow Lark}. The
         Australian bush lark is {Mirafra Horsfieldii}. See
         {Shore lark}.

   {Lark bunting} (Zo["o]l.), a fringilline bird ({Calamospiza
      melanocorys}) found on the plains of the Western United
      States.

   {Lark sparrow} (Zo["o]l.), a sparrow ({Chondestes
      grammacus}), found in the Mississippi Valley and the
      Western United States.

Source : WordNet®

lark
     n 1: North American yellow-breasted songbirds [syn: {meadowlark}]
     2: small songbirds resembling larks [syn: {pipit}, {titlark}]
     3: any of numerous predominantly Old World birds noted for
        their singing
     4: any carefree episode [syn: {escapade}]

lark
     v : play boisterously; "The children frolicked in the garden";
         "the gamboling lambs in the meadows"; "The toddlers
         romped in the playroom" [syn: {frolic}, {rollick}, {skylark},
          {disport}, {sport}, {cavort}, {gambol}, {frisk}, {romp},
          {run around}, {lark about}]