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1. At some undefined point in the near future. I'm meeting Jared and Jennifer later on at the mall.
2. After the point in time something else happens. I thought we could go to dinner, and then maybe we'd see a movie later on.
Subsequently, afterward, as in They served the main course, and later on, the dessert, or When can I use the sewing machine?-Later on, when I'm done. [Late 1800s]