Sodium Carbonate. Sodium carbonate is a sodium salt of carbonic acid and a strong base. It is supplied as a white, odorless powder that is hygroscopic and very soluble in water producing a strong alkaline solution.
1. to refrain from claiming or insisting on; forgo: to waive one's rank. 2. to relinquish (a right) intentionally: to waive an option. 3. to put aside, esp. for the time; defer or dispense with: to waive formalities. 4. to dismiss from consideration or discussion. [1250â1300; Middle English weyven < Anglo-French weyver to make a waif (of someone) by forsaking or outlawing (him or her)]
If you waive your rights, it means that you no longer have said rights. In the above noted circumstance, it would mean that you do not have the right to review specific and composite letters of reccommendation. If you had not waived your rights, it would mean that you can review specific letters of reccommendation.