Verb (5-dan, く, transitive)
1. to hear
誰かと話しているところを聞いたわけか。So you heard them talking with someone.
2. to listen (e.g. to music)
esp. 聴く
3. to ask; to enquire; to query
聴く is used in legal and official contexts
分からないところがあれば聞け。If there is anything you do not understand, ask.
4. to hear about; to hear of; to learn of
5. to follow (advice, order, etc.); to obey; to listen to; to comply with
ぼくの忠告を聞き、警察へ行って、事件を報告してください。Please listen to my advice, go to the police, and report the incident.
6. to hear (e.g. a plea); to grant (a request); to accept (e.g. an argument); to give consideration to
7. to smell (esp. incense); to sample (a fragrance)
8. to taste (alcohol); to try
also 利く