An archaic or obsolete variant of capital (the architectural top of a pillar/column); sometimes spelled capittle.
From Old French capitel, from Latin capitellum (little head). An alternate historical spelling that fell out of favor as 'capital' became standard.
This spelling variant shows how spelling wasn't standardized in medieval times—different writers spelled the same word different ways. The version 'capitle' eventually lost out to 'capital,' but it's still lurking in very old texts!
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