"Buffered" refers to a state or action of temporarily storing or holding something, allowing for smoothness, protection, or a delay in processing. Full definition
Many private nature reserves function as buffer zones for national parks, allowing for the free movement of species, so the parks do not become «biological islands». (arenalobservatorylodge.com)
Consider including a small percentage of buffer for unexpected school expenses excluded from your list. (financialwellness.org)