Of, relating to, or pertaining to an affix; having the nature or function of an affix.
From affix plus the adjectival suffix -ial (variant of -al), meaning 'relating to.' A more technical variant of 'affixal' emphasizing the relational quality.
This is the word linguists use when they want to sound extra technical—'affixial morphology' means they're diving deep into how word parts combine, not just surface grammar.
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