Definition of within preposition from the Oxford Advanced Learner's Dictionary

      

    within

     preposition
    preposition
    BrE BrE//wɪˈðɪn//
     
    ; NAmE NAmE//wɪˈðɪn//
     
     
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  1. 1  before a particular period of time has passed; during a particular period of time You should receive a reply within seven days. The ambulance arrived within minutes of the call being made. Two elections were held within the space of a year.
  2. 2  not further than a particular distance from something a house within a mile of the station Is it within walking distance?
  3. 3  inside the range or limits of something That question is not within the scope of this talk. We are now within range of enemy fire. He finds it hard to live within his income (= without spending more than he earns).
  4. 4  (formal) inside something/somebody The noise seems to be coming from within the building. There is discontent within the farming industry. Despite her grief, she found a hidden strength within herself.
  5. Word Origin late Old English withinnan ‘on the inside’
See the Oxford Advanced American Dictionary entry: within