1.
Complementary things are different from each other but make a good combination. (FORMAL)
To improve the quality of life through work, two ~ strategies are necessary...
He has done experiments ~ to those of Eigen.
ADJ: usu ADJ n, also v-link ADJ to n
complementarity
...the complementarity between public and private authorities.
N-UNCOUNT
2.
Complementary medicine refers to ways of treating patients which are different from the ones used by most Western doctors, for example acupuncture and homoeopathy.
...combining orthodox treatment with a wide range of ~ therapies.
= alternative
? orthodox, conventional
ADJ: ADJ n