1. to have information about something; to be aware of facts
2. to be familiar with a person, place, or thing through experience
3. to have learned and remember something

Examples

• I know the answer to that question.
• Do you know my sister Sarah?
• She knows all the state capitals by heart.
• I would know his voice anywhere.
• We know that the meeting starts at 3 PM.
• He knows this neighborhood very well.
• I know you’re telling the truth.