I. ˈsə-plə-mənt noun
Etymology: Middle English, from Latin supplementum, from supplēre to fill up, complete — more at supply
Date: 14th century
1.
a. : something that completes or makes an addition
b. : dietary supplement
2. : a part added to or issued as a continuation of a book or periodical to correct errors or make additions
3. : an angle or arc that when added to a given angle or arc equals 180°
II. ˈsə-plə-ˌment transitive verb
Date: 1749
: to add or serve as a supplement to
does odd jobs to supplement his income
• sup·ple·men·ta·tion ˌsə-plə-ˌmen-ˈtā-shən, -mən- noun
• sup·ple·ment·er ˈsə-plə-ˌmen-tər noun