( BrE also har·mon·ise ) / ˈhɑːmənaɪz; NAmE ˈhɑːrm-/ verb
1.
[ v ] harmonize (with sth) if two or more things harmonize with each other or one thing harmonizes with the other, the things go well together and produce an attractive result :
The new building does not harmonize with its surroundings.
2.
[ vn ] to make systems or rules similar in different countries or organizations :
the need to harmonize tax levels across the European Union
3.
[ v ] harmonize (with sb/sth) to play or sing music that combines with the main tune to make a pleasing sound
► har·mon·iza·tion , har·mon·isa·tion / ˌhɑːmənaɪˈzeɪʃn; NAmE ˌhɑːrmənəˈz-/ noun [ U , C ]
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WORD ORIGIN
late 15th cent. (in the sense sing or play in harmony ): from French harmoniser , from harmonie from Latin harmonia joining, concord, from Greek , from harmos joint.