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Related to activating: validating, affirming


1. To render active.
2. To make radioactive.
Farlex Partner Medical Dictionary © Farlex 2012


tr.v. acti·vated, acti·vating, acti·vates
1. To set in motion; make active or more active.
2. Biology To convert (certain biological compounds) into biologically active derivatives.

ac′ti·va′tion n.
ac′ti·va′tor n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


(1) To render something active.
(2) To make something radioactive.
Chemistry To convert a compound—e.g., a provitamin or enzyme—into an active form or different compound, in particular one that has a specific biologic action
Example, activation by UV light Ergosterol, lumisterol, tachysterol, vitamin D2
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


1. To render active.
2. To make radioactive.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about activate

Q. Are there any nice activities for adults with autism? I've been helping a very nice man of 45 of years old and I'm looking for some new things I can do with him in our time together. any ideas?

A. Autistic people react wonderfully with animals. for instance- i saw a group of severe Autistic teenagers going to swim with dolphins. the effect was amazing! taking him to the zoo, or even to the park to feed ducks, pet dogs, whatever.. could have a great effect on him.
hope i helped!
tell me how it went.

Q. what is a passive smoking? and is it dangerous as an active?

A. Passive smoking is the exposure to cigarettes smoke emitted from cigarettes smoke by other person. It's dangerous and may increase the risk to several diseases similar to active smoking (one's exposure to smoke emitted from the cigarettes he or she is smoking) although the risk is of lower magnitude. Example for passive smoking is children of smokers etc.

You may read more here:

Q. i swim a lot ! what are the advantages of swimming over other sport activities? on what part of the body does it work the most ?

A. its a good workout but your not really going to burn as much calories as a regular work out.

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References in periodicals archive ?
Activating and fully engaging customers is the key to maximizing investment in loyalty programs.
"If you're not taking the time or putting the proper resources toward fully engaging and activating your customers, you're leaving millions of dollars on the table," Katz says.
Due to the lack of agreement among the courts concerning the need to conduct the search of the pager contemporaneous to the arrest and to ensure the admissibility of evidence obtained as a result of accessing the pager's memory, good practice dictates activating the pager's memory as contemporaneous to the arrest as feasible.
By demethylating HOXA5 promoter DNA, scientists might be able to fight breast cancer by activating p53 in patients, she says.
In these experiments, BPA was found to be 5,000 times less active than DES in activating ER-[alpha] and 1,400 times less active than DES toward ER-[beta] transactivation.
The effects of meiosis activating sterol on in-vitro maturation and fertilization of human oocvtes from stimulated and unstimulated ovaries.
"What would be ideal is, instead of activating this receptor [as capsaicin does], to block it painlessly," says David E.
Peroxisome proliferators exert their effects by activating the peroxisome proliferator-activated receptors (PPARs), members of the nuclear receptor superfamily.
Activating both parental genes -- or neither -- can cause fetal death or a serious disorder.
When it binds to calcium, it starts activating enzymes and thus serves as an intermediate messenger that amplifies chemical cascades inside a cell.
Extracellular ATP triggers IL-1 beta release by activating the purinergic P2Z receptor of human macrophages.
Again, he says, either of two factors may be at work here: Increased flow may bring the vessel wall or the platelets into closer contact with an activating agent, or it may knock more platelets against the vessel wall, where they stick.

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