supplement

1 supplement /ˈsʌpləmənt/ noun
plural supplements
1 supplement
/ˈsʌpləmənt/
noun
plural supplements
Britannica Dictionary definition of SUPPLEMENT
[count]
1 
: something that is added to something else in order to make it complete
2 
: an extra part that is added to a book or newspaper
3 
British : an amount of money that must be paid in addition to the regular price
2 supplement /ˈsʌpləˌmɛnt/ verb
supplements; supplemented; supplementing
2 supplement
/ˈsʌpləˌmɛnt/
verb
supplements; supplemented; supplementing
Britannica Dictionary definition of SUPPLEMENT
[+ object]
: to add something to (something) in order to make it complete

— supplementation

/ˌsʌpləˌmɛnˈteɪʃən/ noun [noncount]