Definify.com
Webster 1913 Edition
Lack
Lack
(lăk)
, Noun.
 [OE. 
lak
; cf. D. lak 
slander, laken 
to blame, OHG. lahan
, AS. leán
.] 1. 
Blame; cause of blame; fault; crime; offense. 
[Obs.] 
Chaucer.
 2. 
Deficiency; want; need; destitution; failure; 
as, a 
. lack 
of sufficient foodShe swooneth now and now for 
lakke 
of blood. Chaucer.
Let his 
 lack 
of years be no impediment. Shakespeare
Lack
,Verb.
 T.
 [
imp. & p. p. 
Lacked 
(lăkt)
; p. pr. & vb. n. 
Lacking
.] 1. 
To blame; to find fault with. 
[Obs.] 
Love them and 
lakke 
them not. Piers Plowman.
2. 
To be without or destitute of; to want; to need. 
If any of you 
 lack 
wisdom, let him ask of God. James i. 5.
Lack
,Verb.
 I.
 1. 
To be wanting; often, impersonally, with 
of
, meaning, to be less than, short, not quite, etc. What hour now?
I think it
I think it
lacks 
of twelve. Shakespeare
Peradventure there shall 
lack 
five of the fifty. Gen. xvii. 28.
2. 
To be in want. 
The young lions do 
 lack
, and suffer hunger. Ps. xxxiv. 10.
Webster 1828 Edition
Lack
LACK
,Verb.
T.
  1.
  To want; to be destitute of; not to have or possess.If any of you lack wisdom, let him ask it of God - James 1.
2.
  To blame.  [Not in use.]LACK
,Verb.
I.
  1.
  To be in want.The young lions do lack and suffer hunger.  Ps. 34.
2.
  To be wanting.Perhaps there shall lack five of the fifty righteous.  
Gen. 18.
LACK
,Noun.
  He that gathered little, had no lack.  Ex. 14.
Lack of rupees is one hundred thousand rupees, which at 55 cents each, amount to fifty five thousand dollars, or at 2s. 6d. sterling, to 12,500 pounds.