Meaning of LACK in English
[lack] vi (13c) 1: to be deficient or missing "time is ~ing for a full explanation"
2: to be short or have need of something "he will not ~ for advisers" ~ vt: to stand in need of: suffer from the absence or deficiency of "~ the necessities of life"
lack n [ME lak; akin to MD lak lack, ON lakr defective] (14c) 1: the fact or state of being wanting or deficient
2: something that is lacking or is needed
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012