Meaning of "answer" in Essential American English Dictionary

answer

verb us /ˈæn·sər/

A1 to speak or write back to someone who has asked you a question:

I asked her what time it was, but she didn’t answer.
I must answer his letter.

A2 to say hello to someone who has telephoned you:

Could someone answer the phone?

B1 to write or say something as a reply to a question in a test

to open the door to someone who has arrived:

I knocked several times, but no one answered.

(Definition of “answer verb” from the Webster's Essential Mini Dictionary © Cambridge University Press)