› [U] HR in the UK, extra money paid to someone because they work in an area where it is expensive to live: The salary of £15,537 increases to £17,778 with London weighting. › [C or U] (also weighting factor [C]) MEASURES a value given to each thing in a group to show its importance when compared with others in the group: Index trackers buy shares in proportion to a company's weighting within a particular market index. Giving each stock equal weighting means that, overall, the fall has been 9.4%. a heavy/high/neutral weighting Different auto insurance companies attach different weighting factors and importance to the deductible.