British spelling: past tense of harmonise; brought into agreement or made coordinated; combined into musical harmony.
Past tense of harmonise (British spelling), formed by adding the -ed suffix. Maintains the British spelling convention throughout the conjugation.
Watching British English verb conjugations reveals how spelling conventions cascade through a word's entire family—harmonise, harmonised, harmonising all keep the -s-, while American harmonize, harmonized, harmonizing keep the -z-, making spelling a complete system rather than individual word choices.
Complete word intelligence in one call. Free tier — 50 lookups/day.