How are extensions defined in the context of player contracts?

Extensions in the context of player contracts refer to amendments that add additional seasons to the existing term of a player's contract. This typically occurs when a team and a player agree to continue their relationship beyond the original term of the contract. By extending the contract, the player commits to the team for a longer period, which can be beneficial for both parties. The team secures the services of the player for additional seasons, while the player may receive improved compensation or security in their contract.

When considering this in relation to the other options, the idea of extensions as new contracts that replace old ones is inaccurate because an extension builds upon the current contract rather than nullifying it. Temporary agreements for injuries do not fit the definition of extensions, as they are typically not related to the long-term commitment of a player or team. Adjustments for salary cap purposes, while important in contract negotiations, do not define an extension but rather pertain to the team's financial strategies regarding player salaries and overall roster management. Thus, the concept of extensions as amendments to an existing contract that add seasons is conceptually and legally the most accurate definition within sports contracts.