What is the meaning of reckon?

verb

• Expect, believe, or suppose.
  • usage: "I imagine she earned a lot of money with her new novel"; "I thought to find her in a bad state"; "he didn't think to find her in the kitchen"; "I guess she is angry at me for standing her up"
  • synonyms: think, opine, suppose, imagine, guess
• Judge to be probable.
  • synonyms: calculate, estimate, count on, figure, forecast
• Deem to be.
  • usage: "She views this quite differently from me"; "I consider her to be shallow"; "I don't see the situation quite as negatively as you do"
  • synonyms: see, consider, view, regard
• Make a mathematical calculation or computation.
  • synonyms: calculate, cipher, cypher, compute, work out, figure
• Have faith or confidence in.
  • usage: "you can count on me to help you any time"; "Look to your friends for support"; "You can bet on that"; "Depend on your family in times of crisis"
  • synonyms: count, bet, depend, look, calculate
• Take account of.
  • usage: "You have to reckon with our opponents"; "Count on the monsoon"
  • synonyms: count