Learner's definition of AGAIN
1
: for another time : one more time再一次；又一次 -
Please, come see us again.请再来看我们。
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Spring is beginning again.春天又来了。
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It was nice to see my friends again.再次见到我的这些朋友真高兴。
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She wants to prove that she can do it again.她想证明还能再做一次。
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Things are back to normal again.一切又恢复到常态了。
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I will never be so foolish again. = Never again will I be so foolish.我决不会再这么傻了。
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When we heard the news, we all said, “Oh no! Not again!”听到这个消息后，我们齐声说：“哦不！不要再来一次吧！”
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She demonstrated yet again her remarkable artistic talents.她再次展现出她非凡的艺术天赋。
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It'll just be the same thing all over again.这不过是同样的事又重来一遍。
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I told him over and over again to be careful. = I told him again and again to be careful. [=I told him many times to be careful]我再三告诫他要小心谨慎。
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She returned to the bookstore again and again. [=repeatedly, many times]她一次又一次地返回书店。
2
: to a previous position or place返回（原先的位置） -
We flew from Boston to Chicago and back again. [=back to Boston]我们从波士顿飞到芝加哥，然后又原路返回。
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When he stood up, he got so dizzy that he had to sit down again.他起身时头一阵晕眩，只好又坐回原处。
3
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used to introduce a thought or possibility that differs from a preceding one再说，另一方面（用于引出与前面所说之事不同的想法或可能性） —
usually used in the phrase then again通常用于短语then again -
He might go, and then again, he might not.他可能去，但也可能不去。
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Then again, perhaps they were right.再说，他们也许是对的。
4
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used to introduce a statement that repeats and stresses something previously said再说一次（用于引出一个说法，重复和强调前面所说之事） 5
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used to ask someone to repeat something because you did not hear or understand it clearly（要求某人）再说一遍 6
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used in phrases like (chiefly US) half again as much and (chiefly Brit) half as much again to compare two amounts比…多一半（用于两个数据的比较）
(every) now and again
— see every
time and again
— see 1time