understand in WordNet English dictionary

1. be understanding of
   "You don't need to explain--I understand!"
   sympathize  sympathise  empathize  empathise  understand 
   
2. believe to be the case
   "I understand you have no previous experience?"
   understand  infer 
   
3. make sense of a language
   "She understands French"; "Can you read Greek?"
   understand  read  interpret  translate 
   
4. perceive (an idea or situation) mentally
   "Now I see!"; "I just can't see your point"; "Does she realize how important this decision is?"; "I don't understand the idea"
   understand  realize  realise  see 
   
5. know and comprehend the nature or meaning of
   "She did not understand her husband"; "I understand what she means"
   understand