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Definition of lag noun from the Oxford Advanced Learner's Dictionary

lag

noun
 
/læɡ/
 
/læɡ/
(also time lag, time lapse)
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  1. the period of time between two connected events see also jet lag, old lag
    Word Originnoun early 16th cent. (as a noun in the sense ‘hindmost person in a game, race, etc.’, also ‘dregs’): related to the dialect adjective lag (perhaps from a fanciful distortion of last, or of Scandinavian origin: compare with Norwegian dialect lagga ‘go slowly’).
See lag in the Oxford Advanced American DictionarySee lag in the Oxford Learner's Dictionary of Academic English

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