supplement
noun [ C ]
uk/ˈsʌplɪmənt/ us COMMUNICATIONS
a part of a newspaper, report, etc. that is published in addition to the main part:
In this supplement we look at how companies can measure their carbon footprint.
a Sunday/monthly/quarterly supplement
a medicine that contains substances that you need to stay healthy in addition to what you get in your food:
dietary/nutritional/food supplements
MARKETING
an additional amount that you pay for a particular service, a better place to stay, etc.:
a supplement of sth We paid a supplement of €40 for a room with a balcony.
HR, WORKPLACE
an amount that you earn in addition to your basic salary:
The income from the investments supports universities by paying for scholarships and salary supplements.
something that is done as an addition to an activity or process in order to improve it:
a supplement to sth The measures were introduced as a supplement to the state's disaster plan.
supplement
verb [ T ]
uk/ˈsʌplɪment/ usto add more people or things to an activity or process in order to improve it:
During especially busy periods, around 175 temporary workers supplement a production workforce of 3,500.
Legal controls have been supplemented by financial controls, especially over capital expenditure.
HR, WORKPLACE
to earn or receive extra money in addition to your basic salary or pension:
Base pay of all executives is £125,000, supplemented by bonuses linked to individual output.
supplement your income/earnings/pension They decided to use the equity in their home to supplement their income.