APPENDIX C â CATEX Long Form Checklist to Support an Environmental Finding of Categorical Exclusion (Catex) This checklist documents consideration of environmental laws, regulations, and executive orders as they apply to Federal actions.
Full Definition of DERIVATION. 1. a (1) : the formation of a word from another word or base (as by the addition of a usually noninflectional affix) (2) : an act of ascertaining or stating the derivation of a word (3) : etymology 1 b: the relation of a word to its base.2. a: source, origin b: descent, origination.3. : something derived: derivative.efinition of DERIVATION for Kids. 1. : the formation of a word from an earlier word or root. 2. : etymology. 3. 4. : an act or process by which one thing is formed from another.
polÂ·yÂ·genÂ·eÂ·sis. derivation from more than one kind of germ cell. the theory that different species are descended from different ultimate ancestors.