Combines or joins with something else; performs mathematical addition. Third person singular present of add.
From Latin 'addere' meaning 'to put to' or 'give to', composed of 'ad-' (to) + 'dare' (to give). The mathematical sense developed alongside the growth of arithmetic and accounting in medieval Europe.
The word 'add' literally means 'to give to' something, which perfectly captures both mathematical and practical addition. When you add sugar to coffee or add a room to a house, you're giving something extra to what already exists.
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