Definition of "derivational" []

• Of or pertaining to derivation; relating to that which is derived. (adjective)

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• "Backformation is the reverse of adding an affix (i.e prefix or suffix) to a word (or if we’re not just talking about English, doing any kind of derivational operation on a word, whether it’s affixing, or repeating a portion of the word, or changing the vowels, etc.)"
• "The - ly suffix (meaning “like”, by the way, and derived from an Old English word meaning “corpse” – cool, no?) is a late-comer to English derivational suffixes, replacing the now purely phonetic final e (used to mean “adverb”, now means “long preceding vowel”)."
• "It would literally have meant '(Town of) flowing waters', from *rūmōn 'river; flowing water', a securely Indo-European formation built on the root *reu- 'to flow, to run (as of liquid)' and the derivational suffix *-mo-."