weighting

weighting
n [U] (esp Brit) extra pay or allowances given in special cases, eg to people working in cities because of the higher cost of living there （在特殊情况下的）额外补贴或津贴（如发给在生活费用高的城市工作的人的）
    [attrib 作定语]
a London weighting allowance 给在伦敦工作的人的额外津贴.

牛津英汉双解词典