Webster's English Dictionary

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derivative

1. de.riv.a.tive \di-'riv-*t-iv\ aj 1: formed by derivation  2: made up of 
   or marked by derived elements  - de.riv.a.tive.ly av
2. derivative n 1: a word formed by derivation  2: something derived  3: 
   the limit of the ratio of the change in a function to the corresponding  
   change in its independent variable as the latter change approaches zero 4a: 
   a chemical substance so related structurally to another substance as to  be 
   theoretically derivable from it 4b: a substance that can be made from 
   another substance in one or more step s