1. a person understands the weather if he/she is able to predict and to give an explanation of some of its features.
2. a psychiatrist undertands another person's anxieties if he/she knows that person's anxieties, their causes, and can give useful advice on how to minimise the anxiety.
3. a person understands a command if he/she knows who gave it, what is expected by the issuer, and whether the command is legitimate.
4. one understands a reasoning, an argument, or a language if one can consciously reproduce the information content conveyed by the message.

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i believe knowledge is the simple awareness of bits of information.

understanding is the awareness of the connectedness of this information.

it is understanding which allows knowledge to be put to use.

understanding represents a higher level than simple knowledge.

meaning to understand a woman u need more than just simple knowledge. haha

to be continue~