Definition of check exclamation from the Oxford Advanced Learner's Dictionary

 

check

 exclamation
exclamation
BrE BrE//tʃek//
 
; NAmE NAmE//tʃek//
 
 
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used to show that you agree with somebody or that something on a list has been dealt with ‘Do you have your tickets?’ ‘Check.’ ‘Passport?’ ‘Check.’ Word Originexclamation Middle English (originally as used in the game of chess): the noun and exclamation from Old French eschec, from medieval Latin scaccus, via Arabic from Persian šāh ‘king’; the verb from Old French eschequier ‘play chess, put in check’. The sense ‘stop or control’ arose from the use in chess, and led (in the late 17th cent.) to ‘examine the accuracy of’.
See the Oxford Advanced American Dictionary entry: check