Learn the meaning and origin of the word supplementary , as well as its pronunciation and frequency in modern English. Find out how supplementary is used in different contexts such as finance, law, geometry, and more. Learn the meaning of supplementary as an adjective or noun, and see how to use it in sentences. Find synonyms, pronunciation, and related words for supplementary . SUPPLEMENTARY definition: 1. If an angle is supplementary to another angle, it forms 180° when combined with it. 2. extra…. Learn more. Supplement and Supplementary both relate to addition, but supplements are items added to compensate for a lack, while supplementary material enhances or completes what's already present.
