har‧mo‧nize (also harmonise British English) /ˈhɑːmənaɪz $ ˈhɑːr-/ verb

1. [intransitive] if two or more things harmonize, they work well together or look good together
harmonize with
The new offices harmonize with the other buildings in the area.

2. [transitive] to make two or more sets of rules, taxes etc the same:
the proposal to harmonize tax levels throughout the EU

3. [intransitive] to sing or play music in harmony

[TahlilGaran] Dictionary of Contemporary English ▲