To make something Australian in character, style, or approach; to adapt something to Australian conditions or cultural values.
From Australian plus the suffix -ize (meaning to make, treat as, or cause to become), following the standard English pattern of creating verbs from nouns.
The -ize verb form reveals English's flexibility: once we have a noun (Australian), we can automatically create a verb (australianize) to describe the process of becoming that thing. This productive suffix has generated thousands of verbs throughout English history.
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