[n.suhp-luh-muh nt; v.suhp-luh-ment] /n. ˈsʌp lə mənt; v. ˈsʌp ləˌmɛnt/
noun
1.
something added to complete a thing, supply a deficiency, or reinforce or extend a whole.
2.
a part added to a book, document, etc., to supply additional or later information, correct errors, or the like.
3.
a part, usually of special character, issued as an additional feature of a newspaper or other periodical.
4.
Geometry. the quantity by which an angle or an arc falls short of 180° or a semicircle.
verb (used with object)
5.
to complete, add to, or extend by a supplement.
6.
to form a supplement or addition to.
7.
to supply (a deficiency).
Origin
1350-1400;Middle English < Latinsupplēmentum that by which anything is made full, equivalent to sup-sup- + plē- (stem of plēre to fill; see full1) + -mentum-ment