The verb understand has 5 senses (first 5 from tagged texts)
1. (111) understand -- (know and comprehend the nature or meaning of; "She did not understand her husband"; "I understand what she means")
2. (29) understand, realize, realise, see -- (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")
3. (9) understand, read, interpret, translate -- (make sense of a language; "She understands French"; "Can you read Greek?")
4. (4) understand, infer -- (believe to be the case; "I understand you have no previous experience?")
5. (1) sympathize, sympathise, empathize, empathise, understand -- (be understanding of; "You don't need to explain--I understand!")