\ˈkän(t)-stə-ˌt(y)üt-iv, kən-ˈstich-ət-iv\

Definition of CONSTITUTIVE

a : of, relating to, or being an enzyme or protein produced in relatively constant amounts in all cells of an organism without regard to cell environmental conditions (as the concentration of a substrate)—compare inducible a b : controlling production of or coding genetic information for a constitutive enzyme or protein <constitutive genes> <constitutive mutations>
: being chromatin of a chromosomal region that is condensed into heterochromatin in all cells of an organism rather than just some
con·sti·tu·tive·ly adverb

Seen & Heard

What made you want to look up constitutive? Please tell us where you read or heard it (including the quote, if possible).