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active duty

1. Current, full-time service in the military. My son is in the army, and I worry so much when he's on active duty.
2. By extension, full-time service in another area of life. I'm still on active duty until I retire at the end of the month.
See also: active, duty

active shooter

A perpetrator (of a potential mass shooting) who is actively shooting at people, typically targeting victims in a crowded and confined space. If there is a report of an active shooter, police aim to respond within minutes. The police were quick to respond to the active shooter situation and disarm the attacker.
See also: active, shooter

on active duty

in battle or ready to go into battle. (Military.) The soldier was on active duty for ten months. That was a long time to be on active duty.
See also: active, duty, on

active duty

Full-time service, as in Julian is 81, but he still comes to the office every day and is very much on active duty . This term comes from the military, where it stands in opposition to reserve, which refers to troops still in the military but not actively engaged. It is occasionally transferred to civilian matters as well. [First half of 1800s]
See also: active, duty
References in classic literature ?
The larvae of insects, whether adapted to the most diverse and active habits, or quite inactive, being fed by their parents or placed in the midst of proper nutriment, yet nearly all pass through a similar worm-like stage of development; but in some few cases, as in that of Aphis, if we look to the admirable drawings by Professor Huxley of the development of this insect, we see no trace of the vermiform stage.
How, then, can we explain these several facts in embryology,--namely the very general, but not universal difference in structure between the embryo and the adult;--of parts in the same individual embryo, which ultimately become very unlike and serve for diverse purposes, being at this early period of growth alike;--of embryos of different species within the same class, generally, but not universally, resembling each other;--of the structure of the embryo not being closely related to its conditions of existence, except when the embryo becomes at any period of life active and has to provide for itself;--of the embryo apparently having sometimes a higher organisation than the mature animal, into which it is developed.
Avoiding the temptations of the town, he continued to pass his life in the country, immersed in the usual pursuits of a hearty, active, country gentleman; his occupations being those of farming, and breeding horses and cattle, diversified with a little hunting and shooting, and enlivened by the occasional companionship of his friends (better friends than those of his youth), and the society of his happy little wife (now cheerful and confiding as heart could wish), and his fine family of stalwart sons and blooming daughters.
With the help of the great dictionary and the active intelligence of a healthy mind endowed by inheritance with more than ordinary reasoning powers he shrewdly guessed at much which he could not really understand, and more often than not his guesses were close to the mark of truth.
There were many breaks in his education, caused by the migratory habits of his tribe, but even when removed from his books his active brain continued to search out the mysteries of his fascinating avocation.
At home he is said to have suffered from the coldness or more active antipathy of his three daughters, which is no great cause for wonder if we must credit the report that he compelled them to read aloud to him in foreign languages of which he had taught them the pronunciation but not the meaning.
But from childhood his abnormally active dramatic imagination had tormented him with dreams and fears of devils and hell-fire, and now he entered on a long and agonizing struggle between his religious instinct and his obstinate self-will.
All hours and all seasons are alike, my good Ellen, to the genuine lover of nature,"--returned a small, slightly made, but exceedingly active man, dressed in an odd mixture of cloth and skins, a little past the middle age, and who advanced directly to her side, with the familiarity of an old acquaintance; "and he who does not know how to find things to admire by this grey light, is ignorant of a large portion of the blessings he enjoys.
But the man who wishes to study the active habits of the feline race, or the variety, albinos, must, indeed, be stirring at this hour.
com), a premier provider of applications for integrating market-related content into Internet, Intranet, and Extranet sites, announces the new release of its Most Actives Snapshot product.
Interoperability between enterprise applications is an essential ingredient for today's organizational success," said Chet Kapoor, vice president, Business Development, Active Software.
Viquity and Active Software have partnered to provide a solution that will enable high-tech manufacturers to respond to change instantaneously.
The wide range of Active Software Intelligent Adapters -- which provide dynamic interfaces for integrating applications, databases, and mainframes -- significantly shortens development time.
The NightFire and Active Software solution will enable CLECs to: