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adj. 1. Located behind a part or toward the rear of a structure. 2. Relating to the caudal end of the body in quadrupeds or the back of the body in humans and other primates. 3. Botany Next to or facing the main stem or axis. 4. Coming after in order; following. 5. Following in time; subsequent. n. The buttocks. [Latin, comparative of posterus, coming after, from post, afterward; see apo- in the Appendix of Indo-European roots.] pos·teri·or·ly adv. |
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