A "reimbursement check" is a financial payment from someone or an organization to compensate you for expenses you have already paid for on their behalf. It is like getting your money back for the amount you spent. Full definition
We had the 90 % reimbursement checks before the credit card bill was even due. (caninejournal.com)
Next time you receive those student loan reimbursement checks, make sure you're not repeating any of my stupid mistakes. (studentloans.net)
We always get fast response from their team with care and clear explanations, and reimbursement checks always arrived within a week or two. (consumersadvocate.org)