Definitions
1.NounA deficiency or need (of something desirable or necessary); an absence, want, dearth.
2.NounA defect or failing; moral or spiritual degeneracy.
3.VerbTo be without, not to have, to need, to require."My life lacks excitement."
4.VerbTo be short (of or for something)."He'll never lack for company while he's got all that money."
5.VerbTo be in want.
6.VerbTo see the deficiency in (someone or something); to find fault with, to malign, reproach.
7.VerbTo be off one's guard."His opps caught him lacking."
8.NounArchaic form of lakh."a lack of rupees"