A person or thing that deals with or groups things in dozens; one who organizes by twelves.
Agent noun formed from the verb 'dozen' plus the suffix '-er,' which turns verbs into people who do them (like 'teach' becomes 'teacher'). Reflects the productive English pattern of creating occupational nouns.
A 'dozen-er' would be someone whose job involves counting things in twelves—like an egg farmer! It shows how English creates job titles by just adding '-er' to whatever the person does.
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