An archaic or obsolete form meaning to entitle or to give a title to something.
From Old French and Medieval Latin, an alternative spelling of 'entitle.' The '-ule' ending is characteristic of older Romance language borrowings into English, particularly common in 14th-15th century texts.
This is basically a fossil word—a variant spelling that existed when English was still figuring out how to spell French words. By Shakespeare's time, 'entitle' had won out, and 'entitule' disappeared into dusty old documents!
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