subdivide - definition and synonyms

verb [transitive] 

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/ˌsʌbdɪˈvaɪd/
present tense
I/you/we/theysubdivide
he/she/itsubdivides
present participlesubdividing
past tensesubdivided
past participlesubdivided
  1. to divide the parts of something that has already been divided

    Each section of the book is subdivided into four chapters.