Capable of being officially recognized or certified as meeting required standards.
The suffix '-able' (capable of being) combines with 'accredit' to create an adjective form, following English's productive word-formation pattern where '-able' attaches to virtually any verb to express possibility.
The '-able' suffix is one of English's most generous morphemes—it can attach to almost any verb to ask 'can this be done?', which is why you can theoretically create thousands of new adjectives even if they're not in the dictionary yet.
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