This appears to be a typographical error or OCR corruption; possibly intended as 'coalesce,' 'concrescence,' or a variant form of Latin concrescere meaning to grow together.
Cannot determine etymology with certainty due to apparent corruption. If 'concrescence,' it comes from Latin concrescere (con- 'together' + crescere 'to grow') plus -ence suffix denoting a process or state.
Sometimes in searching old documents and databases, you find words that look like they're from an alien language—this is likely what happened here, where the word got scrambled in digitization, reminding us that our written records are more fragile than we think.
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