division
US /dɪˈvɪʒ.ən/
UK /dɪˈvɪʒ.ən/

1.
the action of separating something into parts or the process of being separated
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The division of labor increased efficiency.
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There was a clear division between the two groups.
2.
a major administrative or operational unit, especially in a military, business, or educational context
:
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He was transferred to the sales division.
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The army's 101st Airborne Division is famous.
3.
the process of discovering how many times one number is contained in another
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She is learning division in math class.
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The problem involved complex division.