a-pref 前缀1 (with ns, adjs and advs 与名词, 形容词, 副词结合) not; without 不; 无; 非: atheist atypical * asexually. =>Usage at un- 用法见un-.2 (with vs forming adjs 与动词结合构成形容词) in the state or process of 处於...状态或过程中: awake asleep * ablaze * adrift.
牛津英汉双解词典