Final answer:
A root in English is the main part of a word that can be modified by adding affixes to create new words.
Step-by-step explanation:
In English, a root is a word or word part that is the main part of new words through the addition of affixes. It is the base or core of the word. For example, in the word 'happiness,' the root is 'happy.' Adding the suffix 'ness' changes the root into a noun, creating a new word with a related meaning.
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