understand-v; 3 Senses

Sense Number 1: know, realize, and comprehend the meaning

Examples:
I understand what you mean.
The foreigner did not understand what I was trying to say.
She did not understand her husband.
Oh I understand what you mean now!
I don't understand the idea.
You don't have to explain. I understand.

Mappings:
PropBank: understand.01
WordNet 3.0 Sense Numbers: 1, 2, 5

Sense Number 2: know the meaning of words in a (foreign) language

Examples:
I understand French.
He understands enough Spanish to interpret the message.

Mappings:
PropBank: understand.01
WordNet 3.0 Sense Numbers: 3

Sense Number 3: infer or believe to be the case

Examples:
I understand you have no previous experience?
A secret buyer is understood to have paied a million dollars for three pictures.
I understand that you are interested in borrowing some money from us.
Am I to understand your intentions towards my daughter are honorable?

Mappings:
PropBank: understand.01
WordNet 3.0 Sense Numbers: 4