A1 something that you say or write back to someone who has asked you a question: I asked him if he was going, but I didn’t hear his answer.
A2 the act of picking up a telephone or opening a door: I rang the bell, but there was no answer.
A2 the correct information given as a reply to a question in a test: Did you get the answer to question six?
B1 a way of stopping a problem: It’s a big problem, and I don’t know what the answer is.