Capable of being divided or meant to be divided into parts.
From Latin 'dividendus,' the gerundive form of 'dividere' (to divide), meaning 'that which is to be divided.' This form evolved through medieval Latin into English technical vocabulary.
Gerundive forms like this are incredibly rare in modern English—they're frozen fossils from Latin grammar that we inherited through legal and financial terminology. The fact that 'dividendus' survives mainly in the word 'dividend' shows how Latin's grammar system got compressed into English.
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