milestone "milestones"1. (N-COUNT) A milestone is an important event in the history or development of something or someone.E.X: Starting school is a milestone for both children and parents.2. (N-COUNT) A milestone is a stone by the side of a road showing the distances to particular places.overnight "overnights, overnighting, overnighted"1. (ADJ, ADJ after v) If something happens overnight, it happens throughout the night or at some point during the night.E.X: The decision was reached overnight.The weather remained calm overnight.2. (ADJ, ADJ after v) You can say that something happens overnight when it happens very quickly and unexpectedly.E.X: The rules are not going to change overnight.3. (VERB) If you overnight somewhere, you spend the night there.E.X: They had told her she would be overnighting in Sydney.performed "performs, performing, performed"1. (VERB) When you perform a task or action, especially a complicated one, you do it.E.X: several grafts may be performed at one operation.2. (VERB) If someone or something performs well, they work well or achieve a good result. If they perform badly, they work badly or achieve a poor result.E.X: He had not performed well in his exams.obstacle "obstacles"(N-COUNT) An obstacle is an object that makes it difficult for you to go where you want to go, because it is in your way.E.X: Most competition cars will only roll over if they hit an obstacle.To succeed, you must learn to overcome obstacles.

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