Meaning : Know and comprehend the nature or meaning of.
Example :
She did not understand her husband.
I understand what she means.
Meaning : Believe to be the case.
Example :
I understand you have no previous experience?.
Synonyms : infer
Meaning : Be understanding of.
Example :
You don't need to explain--I understand!.
Synonyms : empathise, empathize, sympathise, sympathize