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1. In great detail. I studied American modernism in college, so I can speak about Eliot's poetry at length.
2. For a long period of time. My father always lectures me at length about the dangers of living in the city.
3. Finally. At length, the sermon ended.
1. after some time; finally. At length, the roses bloomed, and the tomatoes ripened. And at length, the wizard spoke.
2. and at some length for quite a long time. He spoke to us about the problem at some length. He described the history of his village at length.
1. In full, extensively. For example, The preacher went on at length about sin, or I have read at length about these cameras. [c. 1500]
2. After a long time, finally, as in At length the procession ended. [Early 1500s] Also see in the long run.
1 (literary) after a long time: ‘I’m not sure,’ he said at length.
2 in great detail and taking a long time: She talked at length about her work in hospitals.
1. After some time; eventually: At length we arrived at our destination.
2. For a considerable time; fully: spoke at length about the court ruling.