Source : Webster's Revised Unabridged Dictionary (1913)

Lac \Lac\, Lakh \Lakh\, n. [Hind. lak, l[=a]kh, l[=a]ksh, Skr.
   laksha a mark, sign, lakh.]
   One hundred thousand; also, a vaguely great number; as, a lac
   of rupees. [Written also {lack}.] [East Indies]

Lakh \Lakh\, n.
   Same as {Lac}, one hundred thousand.

Source : WordNet®

lakh
     n : the cardinal number that is the fifth power of ten [syn: {hundred
         thousand}, {100000}]