guess in WordNet English dictionary

1. judge tentatively or form an estimate of (quantities or time)
   "I estimate this chicken to weigh three pounds"
   estimate  gauge  approximate  guess  judge 
   
2. expect, believe, or suppose
   "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"
   think  opine  suppose  imagine  reckon  guess 
   
3. guess correctly; solve by guessing
   "He guessed the right number of beans in the jar and won the prize"
   guess  infer 
   
4. put forward, of a guess, in spite of possible refutation
   "I am guessing that the price of real estate will rise again"; "I cannot pretend to say that you are wrong"
   guess  venture  pretend  hazard 
   

1. a message expressing an opinion based on incomplete evidence
   guess  conjecture  supposition  surmise  surmisal  speculation  hypothesis 
   
2. an estimate based on little or no information
   guess  guesswork  guessing  shot  dead reckoning