To recondition something means to restore it to good working condition by cleaning, repairing, or replacing worn parts. When a mechanic reconditions an engine, they take it apart, fix what's broken, clean everything thoroughly, and replace parts that are too worn out to work properly anymore. The goal is to make the engine run like new again, even though it's been used before.

You might see reconditioned laptops or phones for sale: these devices have been inspected, repaired if needed, and tested to make sure they work well. They cost less than brand-new items but work just as reliably. A factory might recondition old machinery instead of buying replacements, saving money while keeping production running smoothly.

The word can also describe preparing something that's been idle or neglected. An athlete who took time off might need to recondition their body, gradually rebuilding strength and endurance through training. A building that sat empty for years might be reconditioned before people can use it again.

Reconditioning differs from simple cleaning or from throwing something away and starting over. It means putting in real effort to bring something worn or tired back to a reliable, working condition.