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tr.v. ac·ti·vat·ed, ac·ti·vat·ing, ac·ti·vates
1. To set in motion; make active or more active.
2. To organize or create (a military unit, for example): activate the National Guard.
3. To treat (sewage) with aeration and bacteria to aid decomposition.
4. Chemistry To accelerate a reaction in, as by heat.
5. Physics To make (a substance) radioactive.
6. Biology To convert (a molecule or cell) into a form that carries out a specific action: activate an enzyme; activate B cells.

ac′ti·va′tion n.
ac′ti·va′tor n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.activated - (of sewage) treated with aeration and bacteria to aid decompositionactivated - (of sewage) treated with aeration and bacteria to aid decomposition
treated - subjected to a physical (or chemical) treatment or action or agent; "the sludge of treated sewage can be used as fertilizer"; "treated timbers resist rot"; "treated fabrics resist wrinkling"
2.activated - (of e.g. a molecule) made reactive or more reactive
natural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics"
reactive - participating readily in reactions; "sodium is a reactive metal"; "free radicals are very reactive"
3.activated - rendered activeactivated - rendered active; e.g. rendered radioactive or luminescent or photosensitive or conductive
active - exerting influence or producing a change or effect; "an active ingredient"
4.activated - (military) set up and placed on active assignment; "a newly activated unit"
armed forces, armed services, military, military machine, war machine - the military forces of a nation; "their military is the largest in the region"; "the military machine is the same one we faced in 1991 but now it is weaker"
active - engaged in full-time work; "active duty"; "though past retirement age he is still active in his profession"
References in periodicals archive ?
com)-- Activated Carbon manufacturers should offer silver impregnated activated carbon that is compliant with the new Biocidal Products Regulations to ensure that downstream users can make the necessary anti-microbial and anti-bacterial claims for their products.
This report by Technavio provides an in-depth analysis of the global activated carbon market in terms of revenue and emerging market trends.
Once T cells and other immune cells have become fully activated (which usually takes place while the cells are in one of the body's lymph nodes), they use certain molecules on their surface to control their movement out of lymph nodes and into the blood stream.
Heat-activated pressure-sensitive adhesive tape is a continuous foam tape using a heat activated adhesive on one side of the foam to bond to the elastomer extrusion.
In this study, we found that Cu and V produced strong vasoconstriction and activated ERK1/2 and p38.
Manual on the Causes and Control of Activated Sludge Bulking and Foaming, Second Edition
Levitt tried giving people activated charcoal--which binds the sulfur .
Since the normal function of the chemokine receptors used by HIV-I for entry is to activate cells in response to various stimuli, he hypothesized that the virus itself (or its envelope glycoprotein gp120 that mediates attachment to cells) might mimic natural activation signals and he responsible for inflammation and injury in organs like brain and lung where macrophages are infected and also activated.
Internally, the destructive potential is activated by the stress reaction.
Proneuron Biotechnologies, Ness-Ziona, Israel, a privately held company, has initiated a second Phase 1 clinical trial of autologous activated macrophage therapy for patients with complete spinal cord injury.
US demand for activated carbon is forecast to increase 4.