Final answer:
Derivation is the process of creating new words from existing words through affixation.
Step-by-step explanation:
The process of creating new words from existing words by affixation is called derivation. Derivation is a common phenomenon in the English language and allows for the creation of new words by adding prefixes or suffixes to existing words. For example, the noun 'friend' can be turned into the verb 'befriend' by adding the prefix 'be-'.
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