What is Lack?

Lack definition and meaning on Dictionary terms:
deficiency or absence of something needed, desirable, or customary: lack of money; lack of skill.
something missing or needed: After he left, they really felt the lack.

verb (used with object)
to be without or deficient in: to lack ability; to lack the necessities of life.
to fall short in respect of: He lacks three votes to win.

verb (used without object)
to be absent or missing, as something needed or desirable: Three votes are lacking to make a majority.