1 [C] a/the habit (of doing sth) something that you do often and almost without thinking, especially sth that is hard to stop doing 习惯: I'm trying to get into the habit of hanging up my clothes every night. 我想要养成每天晚上把衣服挂起来的习惯。Once you start smoking it's hard to break the habit. 一旦开始抽烟，就很难戒除这种习惯。 ☞adjective habitual 形容词为habitual

2 [U] usual behaviour 惯常的行为: I think I only smoke out of habit now -- I don't really enjoy it. 我想我现在并不真的喜欢抽烟，只是习以为常罢了。