Present participle of accustomize; the process of making someone accustomed to something.
From accustomize plus -ing, the present participle suffix. Follows the standard pattern where -ize verbs drop the e before adding -ing.
English spelling rules require dropping the 'e' before adding '-ing' to words ending in silent 'e' (customize → customizing), a rule that prevents awkward double letters and keeps pronunciation smooth.
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