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

      

    below

     preposition
    preposition
    BrE BrE//bɪˈləʊ//
     
    ; NAmE NAmE//bɪˈloʊ//
     
     
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  1. 1  at or to a lower level or position than somebody/something He dived below the surface of the water. Please do not write below this line. Skirts will be worn below (= long enough to cover) the knee.
  2. 2  of a lower amount or standard than somebody/something The temperatures remained below freezing all day. Her work was well below average for the class.
  3. 3  of a lower rank or of less importance than somebody/something A police sergeant is below an inspector.
  4. Word Origin late Middle English (as an adverb): from be- ‘by’ + the adjective low. Not common until the 16th cent., the word developed a prepositional use and was frequent in Shakespeare.
See the Oxford Advanced American Dictionary entry: below