noun , verb
■ noun / ˈsʌplɪmənt; NAmE /
1.
supplement (to sth) a thing that is added to sth else to improve or complete it :
vitamin / dietary supplements (= vitamins and other foods eaten in addition to what you usually eat)
Industrial sponsorship is a supplement to government funding.
2.
an extra separate section, often in the form of a magazine, that is sold with a newspaper :
the Sunday colour supplements
3.
supplement (to sth) a book or a section at the end of a book that gives extra information or deals with a special subject :
the supplement to the Oxford English Dictionary
4.
an amount of money that you pay for an extra service or item, especially in addition to the basic cost of a holiday / vacation
SYN surcharge :
There is a £10 supplement for a single room.
Safety deposit boxes are available at a supplement .
■ verb
/ ˈsʌplɪment/ [ vn ] supplement sth (with sth) to add sth to sth in order to improve it or make it more complete :
a diet supplemented with vitamin pills
He supplements his income by giving private lessons.
••
WORD ORIGIN
late Middle English : from Latin supplementum , from supplere fill up, complete, from sub- from below + plere fill.