What term refers to pre-execution changes made to contract documents?

The term that refers specifically to pre-execution changes made to contract documents is "addenda." Addenda are typically used to clarify, modify, or supplement the original terms prior to the execution of a contract. They are common during the bidding process in construction and other project-based contracts, allowing parties to address questions, provide additional information, or adjust terms before finalizing the agreement.

Change orders and modifications, while related to contract adjustments, usually occur after the contract has been executed. Change orders typically refer to changes in the terms of the agreement after the contract has been signed, especially in construction projects, while modifications can refer to both pre- and post-execution changes but often denote adjustments made after the contract's initial signing.

Thus, "addenda" is the most appropriate term for changes made specifically before execution, making it the correct choice in this context.