derivational adj : characterized by inflections indicating a semantic relation between a word and its base; "the morphological relation between `sing' and `singer' and `song' is derivational" [ant: inflectional]

Derivation may mean:

• Differential algebra
• Derivation (abstract algebra)
• Derivation (linguistics)
• Derivation (logic) -- another name for a mathematical proof because the results are derived from the basic rules of the language used.

Derivation may also refer to:

• Parse tree
• The creation of a derived row, in the twelve-tone musical technique
• An after-the-fact justification for an action, in the work of sociologist Vilfredo Pareto