Relating to or involving a section or cut made together with another, or existing as a complementary section.
From 'co-' (together) combined with 'sectional' (relating to a section or part), though this is an extremely rare or archaic term with limited documented usage.
This word is so uncommon that it barely appears in modern English, representing a 'fossil word' that linguists find interesting because it shows how many potential word combinations existed in older English but were abandoned.
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