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

      

    above

     preposition
    preposition
    BrE BrE//əˈbʌv//
     
    ; NAmE NAmE//əˈbʌv//
     
     
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  1. 1  at or to a higher place or position than something/somebody The water came above our knees. We were flying above the clouds. the people in the apartment above mine A captain in the navy ranks above a captain in the army. They finished the year six places above their local rivals.
  2. 2  more than something; greater in number, level or age than somebody/something Inflation is above 6%. Temperatures have been above average. We cannot accept children above the age of 10. Which Word?above / over Above and over can both be used to describe a position higher than something:They built a new room above/​over the garage. When you are talking about movement from one side of something to the other, you can only use over:They jumped over the stream. Over can also mean ‘covering’:He put a blanket over the sleeping child. Above and over can also mean ‘more than’. Above is used in relation to a minimum level or a fixed point:2 000 feet above sea level Temperatures will not rise above zero tonight. Over is used with numbers, ages, money and time:He’s over 50. It costs over £100. We waited over 2 hours.
  3. 3of greater importance or of higher quality than somebody/something I rate her above most other players of her age.
  4. 4too good or too honest to do something She's not above lying when it suits her. He's above suspicion (= he is completely trusted).
  5. 5(of a sound) louder or clearer than another sound I couldn't hear her above the noise of the traffic.
  6. Word Origin Old English abufan (as an adverb), from a- ‘on’ + bufan (from bi ‘by’ + ufan ‘above’).Idioms  most important of all; especially Above all, keep in touch. Language BankemphasisHighlighting an important point This case emphasizes/highlights the importance of honest communication between managers and employees. Effective communication skills are essential/crucial/vital. It should be noted that this study considers only verbal communication. Non-verbal communication is not dealt with here. It is important to remember that/An important point to remember is that non-verbal communication plays a key role in getting your message across. Communication is not only about the words you use but also your body language and, especially/above all, the effectiveness with which you listen. I would like to draw attention to the role of listening in effective communication. Choose your words carefully: in particular, avoid confusing and ambiguous language. Finally, and perhaps most importantly, you must learn to listen as well as to speak. (disapproving) having too high an opinion of yourself in addition to something There are other factors over and above those we have discussed.
See the Oxford Advanced American Dictionary entry: above