The definition of supplementary is something that is added on, or that completes something.
An example of supplementary is a workbook that comes with a regular textbook.
supplying what is lacking; additional
a supplementary person or thing
(comparative more supplementary, superlative most supplementary)
- Helen Keller's letters are important, not only as a supplementary story of her life, but as a demonstration of her growth in thought and expression--the growth which in itself has made her distinguished.
- Supplementary to the preceding was the Nova litteraria Germaniae collecta Hamburgi (1703-1709), which from 1707 widened its field of view to the whole of Europe.
- 20 and the supplementary treaty Aug.
- A supplementary statement of births, deaths and marriages for each parish was required from the clergy, who transmitted it to parliament through the bishops and primates successively.
- Even the manuscripts left at his death were so incomplete that Todhunter, into whose hands they were put, found it impossible to use them in the publication of a second edition of the original treatise, and wisely printed them, in 1865, in a supplementary volume.