ˈaktəˌvāt, usu -ād.+V verb
( -ed/-ing/-s )
Etymology: active + -ate
transitive verb
: to make active or more active: as
a.
(1) : to render (molecules) capable of reaction or to increase the reactivity of (parts of molecules) by the presence of neighboring groups
(2) : to convert (a compound, as a provitamin or enzyme) into an active form or different compound, especially into one that has a particular biological action
activate ergosterol by irradiation to vitamin D 2 for use in treating rickets
b. : to render (a substance) radioactive, luminescent, photosensitive, or photoconductive by treatment (as by radiation or electric oscillation) or by admixture of an impurity
c.
(1) : to alter the nature of the surface of (specific mineral particles in the flotation of an ore pulp) so that certain reagents will adhere
(2) : to treat (materials, as carbon, clay, alumina, silica gel) so as to improve especially adsorptive properties (as for use in removing colors from sugar solutions and other solutions, chemicals from vapor lines, and odors from water)
d. : to treat by prolonged aeration so as to favor the growth of organisms that will decompose (sewage)
e.
(1) : to start development of (an egg) by fertilization or experimentally by chemicals
(2) : to stimulate to sexual activity : induce heat or rut in
f. : to set up or formally institute (a military unit) with the necessary personnel and equipment
intransitive verb
: to become active
Synonyms: see vitalize