com·ple·men·ta·ry 
/ˌkɑ:mpləˈmɛntəri/ adjective
/ˌkɑ:mpləˈmɛntəri/ adjective [more complementary; most complementary] 1 : completing something else or making it better : serving as a complement
▪ She wore a new outfit with a complementary scarf. 2 — used of two things when each adds something to the other or helps to make the other better ▪ The print and online publications are complementary, not competitive. ▪ The company owes its success to the complementary talents of its co-owners. 3 : going together well : working well together
▪ My spouse and I have complementary goals. ▪ complementary flavors 4 : not traditional : alternative
▪ complementary medicine [=alternative medicine; methods of healing or treating disease that are different from the usual methods taught in Western medical schools]
▪ She wore a new outfit with a complementary scarf.
▪ My spouse and I have complementary goals. ▪ complementary flavors
▪ complementary medicine [=alternative medicine; methods of healing or treating disease that are different from the usual methods taught in Western medical schools]
Do not confuse complementary with complimentary.
