Derivation/ˌderɪˈveɪʃn/ Definition 1 of 4Pro Tip 1/2Word Formation Understand how adding prefixes or suffixes changes meaning. 'Unhappiness' comes from adding 'un-' for negation and '-ness' for state to 'happy'. Pro Tip 2/2Common Roots Recognizing common roots can help guess meanings. Both 'derive' and 'derivation' share the root 'de-', indicating a process.