Definition of this adverb from the Oxford Advanced Learner's Dictionary

 

this

 adverb
adverb
BrE BrE//ðɪs//
 
; NAmE NAmE//ðɪs//
 
 
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to this degree; so It's about this high (= as high as I am showing you with my hands). I didn't think we'd get this far. Word Origin Old English, neuter of thes, of West Germanic origin; related to that and the.
See the Oxford Advanced American Dictionary entry: this