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 reason reason /ˈriːzən/

noun

  1. () A rational motive for a belief or action  ( ground , reason )
    a rational motive for a belief or action
     The reason that war was declared
    the reason that war was declared
     The grounds for their declaration
    the grounds for their declaration
  2. () An explanation of the cause of some phenomenon  ( reason )
    an explanation of the cause of some phenomenon
     The reason a steady state was never reached was that the back pressure built up too slowly
    the reason a steady state was never reached was that the back pressure built up too slowly
  3. () The capacity for rational thought, inference or discrimination  ( intellect , understanding , reason )
    the capacity for rational thought, inference or discrimination
     We are told that man is endowed with reason and capable of distinguishing good from evil
    we are told that man is endowed with reason and capable of distinguishing good from evil
  4. () A justification for something existing or happening  ( grounds , reason , cause )
    a justification for something existing or happening
     He had no cause to complain
    he had no cause to complain
     They had good reason to rejoice
    they had good reason to rejoice
  5. () The state of having good sense and sound judgment  ( rationality , reasonableness , reason )
    the state of having good sense and sound judgment
     His rationality may have been impaired
    his rationality may have been impaired
     He had to rely less on reason than on rousing their emotions
    he had to rely less on reason than on rousing their emotions
  6. A fact that logically justifies some premise or conclusion  ( reason )
    a fact that logically justifies some premise or conclusion
     There is reason to believe he is lying
    there is reason to believe he is lying

verb

  1. () Decide by reasoning; draw or come to a conclusion  ( reason out , reason , conclude )
    decide by reasoning; draw or come to a conclusion
     We reasoned that it was cheaper to rent than to buy a house
    We reasoned that it was cheaper to rent than to buy a house
  2. () Present reasons and arguments  ( reason , argue )
    present reasons and arguments
      The couple always argue about money.
    The couple always argue about money.
  3. () Think logically  ( reason )
    think logically
     The children must learn to reason
    The children must learn to reason