1 an insufficiency, shortage, or absence of something required or desired
2 something that is required but is absent or in short supply
3 when intr, often foll by: in or for to be deficient (in) or have need (of)
to lack purpose
(C12: related to Middle Dutch laken to be wanting)
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"