To contain something or someone as part of a whole; to make someone part of a group or activity.
From Latin 'includere' meaning 'to shut in, enclose', from 'in-' (in) and 'claudere' (to shut, close). It originally meant to close something in on all sides.
To include is to ‘close in’ around something so it belongs inside the group. The social meaning—making sure no one is left out—is just as powerful as the mathematical or logical one.
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