1. The process of bringing different things into agreement or making them compatible with each other.
Usage: British spelling; American English typically uses 'harmonization'; Often used in formal or technical contexts
2. In music, the arrangement of notes or chords to create a pleasing combination of sounds.
Usage: Musical context

Examples

• The harmonisation of tax policies across European countries aims to create a fairer system.
• International harmonisation of safety standards helps protect consumers worldwide.
• The harmonisation of the different departments' schedules improved overall productivity.
• The composer's harmonisation of the melody added depth and richness to the piece.
• Harmonisation between the two companies' systems was necessary for the merger to succeed.
• The harmonisation of environmental regulations strengthens climate protection efforts.