British spelling: present participle of harmonise; the process of bringing into agreement or creating musical harmony.
From harmonise plus the suffix -ing (forming gerunds and present participles). Maintains British spelling convention.
The -ing suffix is unique because it works simultaneously as three different things: a verb form, a noun (gerund), and an adjective—'harmonising forces' can be all three, which is why this one little suffix is probably the hardest for learners to pin down.
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