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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.


(ˈæk təˌveɪ tər)

1. a person or thing that activates.
2. Chem., Biochem. a catalyst.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.activator - (biology) any agency bringing about activationactivator - (biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription
substance - the real physical matter of which a person or thing consists; "DNA is the substance of our genes"
biological science, biology - the science that studies living organisms
activating agent - (mineral extraction) a surface-active chemical used in flotation process to increase the attraction to a specific mineral
catalyst, accelerator - (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
sensitiser, sensitizer - (chemistry) a substance other than a catalyst that facilitates the start of a catalytic reaction
inhibitor - a substance that retards or stops an activity


[ˈæktɪˌveɪtəʳ] Nactivador m


n activador m
References in classic literature ?
He was one of those delightful, irresponsible, erratic persons whose heads thoughts of this kind do not enter, and who are about as deadly to those whose lives are bound up with theirs as a Upas tree.
When you first came upon me, sir, in the Lodge, this day, more as if a Upas tree had been made a capture of than a private defendant, such mingled streams of feelings broke loose again within me, that everything was for the first few minutes swept away before them, and I was going round and round in a vortex.
Its design incorporated both parallel and crossover elements: Some patients who were on placebo crossed over to one of two doses of UPA after a washout period; and some patients on each active arm crossed over to placebo.
Analyses from this presentation evaluated the efficacy of UPA regardless of a woman's body mass index (BMI) or race.
Jaitley said the last two years of UPA government had double digit price rise, with consumer price inflation at 10.
At the time when the Governor-General spoke these words, two movements were being targeted especially by the Portuguese colonial regime: the MPLA (Movimento Popular de Libertagao de Angola) and the UPA (Uniao das Populates de Angola).
Powerful sugarcane cooperatives, led by major UPA supporters, supposedly drove the government to fix extravagant prices and write off sugar farmers' bad debts, leading to overproduction.
The C-Voter exit poll suggests that the NDA might get around 289 seats while the UPA will get only 101 seats.
Modi reached Delhi on Tuesday morning to attend the BJP parliamentary board meet to strategise on pinning down the UPA, a day before it completes 9 years in power.
However, SP's threat failed to move the UPA even a bit with Prime Minister Manmohan Singh saying that his government would complete its full term.
Prime Minister Manmohan Singh also asserted that UPA has the numbers.