- A deficiency or need (of something desirable or necessary); an absence, want.
- (obsolete) A defect or failing; moral or spiritual degeneracy.
- (intransitive) To be in want.
- (intransitive) To be short (of or for something).
"He'll never lack for company while he's got all that money."
- (transitive) To be without, to need, to require.
"My life lacks excitement."
- (obsolete) To see the ‘lack’ in (someone or something); to find fault with, to malign, reproach.