Also found in: Dictionary, Thesaurus, Legal, Financial, Acronyms, Idioms, Encyclopedia.


/ac·tive/ (ak´tiv) characterized by action; not passive; not expectant.


adjective A term of art defined by users in different fields:
Referring to the presence of neutrophils in gastric biopsies. Active is loosely equivalent to “acute” and often indicates infection by Helicobacter pylori.

Not passive; not expectant, as in active disease, which contrasts to quiescent disease.


A term of art defined by users in different fields. In gastroenterology, active refers to presence of neutrophils in gastric biopsies. Active is loosely equivalent to “acute” and often indicates infection by Helicobacter pylori.


adjective Not passive, not expectant


A brand name for testing strips for blood glucose in the range 0.6 to 33.3 mmol per litre.


adj in orthodontics, pertaining to the condition of an orthodontic appliance that has been adjusted to apply effective force to the teeth or jaws.
active reciprocation,


not passive.

active principle
the drugs or chemicals in a pharmaceutical preparation that exert an effect pharmacologically; as distinct from the inert fillers, wetting agents and other excipients also often included.
active site
that region of a protein, usually an enzyme, that binds to another molecule such as the substrate of the enzyme.
active transport
the movement of ions or molecules assisted by a carrier protein across the cell membranes and epithelial layers, usually against a concentration gradient, resulting directly from the expenditure of metabolic energy. For example, under normal circumstances more potassium ions are present within the cell and more sodium ions extracellularly. The process of maintaining these normal differences in electrolytic composition between the intracellular fluids is active transport. The process differs from simple diffusion or osmosis in that it requires the expenditure of metabolic energy.

Patient discussion about active

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.

More discussions about active
References in periodicals archive ?
13] Active learning needs to be modified to accommodate the characteristics of this new generation.
Ongoing active archiving (daily, weekly or monthly) helps manage data growth and keeps applications operating at peak performance.
Logistic regression analyses that controlled for ethnicity, age and school type revealed that bisexually active youths had significantly higher odds of having had an STD (odds ratio, 5.
Continuous Change Detection - Unlike products that take periodic "snapshots" of monitored systems, Active Reasoning System 5 offers realtime detection, logging and alerting of unauthorized changes and out-of-compliance actions to facilitate remediation.
The questionnaire revealed no change in student perceptions either of the course or instructor behavior (Part 1 of the questionnaire), compared to previous semesters when only minimum active learning techniques were present.
In this lowest level, relational databases work with underlying storage software to keep the most active data easily accessible.
195-1, a taxpayer electing to amortize start-up expenditures must, at the time of election, select an amortization period of not less than 60 months, beginning with the month the active trade or business begins.
The Active Reasoning platform is the solution that bridges the gap between effective Change Management and enabling compliance," said Bill Sheridan, vice president of sales at Advanced MarketPlace.
In addition, active archiving also stores the meta data associated with the database to the active archive as well as information about the data model at the time the data was archived.
Likewise Identity allows us to adhere to our strategy of centralizing user account management in Active Directory for all systems, strengthen the security of our network, and lower operational overhead.
Active Directory is a distributed, peer-to-peer system with a great deal of redundancy and represents, among other things, Microsoft's response to the threat of the Novell Directory Service (NDS), which has a considerable lead in development time and installed base over Active Directory.