To cause to undergo amalgamation; to combine or blend different elements together into a unified whole.
From amalgamate plus the suffix -ize (indicating 'to cause to become' or 'to make'). The -ize suffix is particularly productive in English for creating verbs with causative meanings.
The -ize suffix is so powerful in English that you can practically 'amalgamatize' any noun or adjective to create a new verb—but only certain coinages actually stick in the language, which shows how usage, not grammar rules, ultimately determines what's a 'real' word.
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