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Wisdom is knowing things that help a person to live sensibly and make good decisions. Wisdom is defined differently by many cultures. Some say that wisdom is something a person learns as they grow older. Other cultures expect people to complete certain rituals in order to get wisdom.
If someone has wisdom we say he is wise.
Most cultures from the past have had special people who were supposed to be wise. People asked them for advice when they had problems because they knew things that ordinary people did not know or could not know. They were often called "sages".