Plural noun form: prefixes, suffixes, or infixes added to words; Third-person singular verb: attaches or fastens.
From affix in both plural noun and conjugated verb forms. Applies both to the grammatical units and the action of attaching.
English has thousands of affixes—'un-', '-ing', '-ness', '-tion'—and they're so productive that you can understand brand-new combinations like 'unfriend' instantly because you know the affixing rules.
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