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To "retain" means to keep possession of something, whether it be a physical item, information, or a memory. When you retain something, you are holding onto it and not letting it go or giving it away. This concept is widely applicable in various contexts, such as retaining knowledge after studying or retaining an object in your possession. The other options describe actions that are contrary to retaining; losing possession, sharing, or disregarding all imply a lack of retention, as they involve either giving something away or failing to keep it. Therefore, the meaning of "retain" closely aligns with the idea of keeping something, making the understanding of this term crucial in many discussions and subject areas.