- acting as or forming a complement; completing
- forming a satisfactory or balanced whole
- involving or using the treatments and techniques of complementary medicine
WordReference Random House Learner's Dictionary of American English © 2026
com•ple•men•ta•ry /ˌkɑmpləˈmɛntəri/USA pronunciation adj.
WordReference Random House Unabridged Dictionary of American English © 2026- complementing or completing.
com•ple•men•ta•ry
(kom′plə men′tə rē, -trē),USA pronunciation adj., n., pl. -ries.
adj.
n.
com′ple•men′ta•ri•ness, n.
adj.
- forming a complement;
completing. - complementing each other.
n.
- Fine ArtSee complementary color (def. 1).
- complement + -ary 1590–1600
Collins Concise English Dictionary © HarperCollins Publishers::
complementary /ˌkɒmplɪˈmɛntərɪ; -trɪ/, complemental adj