within Definition in the Cambridge English Dictionary
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Definition of “within” - English Dictionary

Definition of "within" - American English Dictionary

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withinpreposition, adverb [not gradable]

 us   /wɪθˈɪn, wɪð-/
inside or not beyond (a ​particulararea, ​limit, or ​period of ​time): Most Californians ​live within 20 ​miles of the ​coast. The ​tickets should ​reach you within a ​week. The ​company has always ​acted within the ​law (= ​legally).
(Definition of within from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "within" - British English Dictionary

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withinpreposition, adverb

uk   us   /wɪˈðɪn/
B1 inside or not ​further than an ​area or ​period of ​time: Two ​thirds of Californians ​live within 15 ​miles of the ​coast. In 1992 ​cross-bordercontrols within the EU were ​dismantled. For ​orders within the UK, ​pleaseenclose £2.50 for ​post and ​packing. The ​resortlies within easyreach of (= not ​far from) the ​skislopes. We ​recommend that this ​wine should be ​consumed within six ​months. Within ​hours of the ​tragedyhappening, an ​emergencyrescueteam had been ​assembled. The ​tickets should ​reach you within the ​week (= before the end of this ​week). He's very ​highlyregarded within his ​profession. She ​managed to ​complete her last ​film well within ​budget. The ​target was now within ​range and so she took ​aim and ​fired. He could ​sense that his ​goal was within reach (= it could be ​reached). The ​cathedralspire was now within ​sight (= it could be ​seen). I was ​acting within the ​law (= ​legally). We came within five ​points of ​beating them (= we would have ​beaten them if we had had five more ​points).
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(Definition of within from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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