• Webster's Revised Unabridged Dictionary
    • a Single-acting Having simplicity of action; especially Mach, acting or exerting force during strokes in one direction only; -- said of a reciprocating engine, pump, etc.
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Century Dictionary and Cyclopedia
    • single-acting Of any reciprocating machine or implement, acting effectively in only one direction: distinguished from double-acting. Specifically applied to any machine—as a pump, a steam-engine, etc.—in which work is performed by, or performed upon, a reciprocating plunger or piston, and in which only one of the two strokes of the plunger or piston during a single reciprocation is effective.
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Chambers's Twentieth Century Dictionary
    • adjs Single-acting acting effectively in one direction only—of any reciprocating machine or implement
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  • Source Unknown
    Source Unknown
    “Character is made by many acts; it may be lost by a single one.”


Chambers's Twentieth Century Dictionary
O. Fr.,—L. sin-gulus, one to each, separate, akin to sem-el, once, Gr. ham-a.


In literature:

He could not do one single act which would endure so strict a scrutiny.
"Bunyan" by James Anthony Froude
When they act singly, they turn the globe either upward, downward, inward, or outward.
"Special Report on Diseases of Cattle" by U.S. Department of Agriculture
This single act of hostility could not but be soon forgotten in the course of time.
"Christology of the Old Testament: And a Commentary on the Messianic Predictions, v. 1" by Ernst Wilhelm Hengstenberg
Such people never act singly.
"The Sign of Silence" by William Le Queux
Seeing this, and acting upon the hint it conveyed, were a single process with Finn.
"Finn The Wolfhound" by A. J. Dawson
This I can say: I do not remember one single malicious act done to myself.
"The Works of Robert Louis Stevenson, Volume 9" by Robert Louis Stevenson
The student need not despair because so many separate acts seem necessary to the production of even a single tone.
"The Voice" by Frank E. Miller
I was in no single instance privy to any illegal acts, or to any preparations for such acts.
"My Three Years in America" by Johann Heinrich Andreas Hermann Albrecht Graf von Bernstorff
She had been betrayed by a single act of irresistible passion.
"Coquette" by Frank Swinnerton
Extends to the Commissioners the powers vested in the private committee, as to single patients, by the Act 8 and 9 Vict., c. 100, s. 111.
"Chapters in the History of the Insane in the British Isles" by Daniel Hack Tuke

In poetry:

There's scarce a single act of wrong,
Or crime, the list of crimes among,
Which I, alas! did not plunge in,
Immers'd up to the very chin.
"Lamentation Of A Sinner" by Rees Prichard
Though on the field that Death has won,
She save some stragglers in retreat;--
These single acts of mercy done
Are but confessions of defeat.
"For The Meeting Of The National Sanitary Association" by Oliver Wendell Holmes

In news:

I'm a friendly single guy, but when I talk to girls they act as though I'm making them uncomfortable.
A single control acts as the master for quickly setting the desired listening level.
The first single from the Odd Future act's upcoming 'Numbers' LP.
Mike Kalush honors balancing act of single parenthood.
As his trial resumed today, hundreds of Bosnians gathered in the streets of Sarajevo to remember the killing of some 7,000 men in Srebrenica, the worst single act of brutality in Europe since the Nazi period.
In Marcia Angell's critique of Ronald Dworkin's article about the Affordable Care Act's mandate to buy health insurance, she advocates for replacing the ACA with a single-payer system.
Although their political roots are deep, it is often a single spark that ignites them — an assassination, perhaps, or one selfless act of defiance.
Sage has launched its Act by Sage Premium Dual Access, a single software license that allows small and midsize businesses, workgroups and sales teams to have constant online/offline access to their databases.
If you look at " punting on fourth down" as a set of averages over time as opposed to single, mutually exclusive acts, you will find that the math says a team is better off to never punt .
FBI Charges 22 Over Foreign Bribe US justice officials said the charges represented the largest single investigation and prosecution carried out so far under the Foreign Corrupt Practices Act.
In a statement to the court, O'Brady said she is remorseful for what she called "a single act of stupidity" and asked McCann to allow the loss of her reputation to be enough punishment.
WHEN a school of reef fish loses its single male, the largest female begins acting like a male within a few hours and will produce sperm within 10 days.
Single-acting hydraulic clamps for quick mold change (QMC) are new from EAS Mold and Die Change Systems, Menomonee Falls, Wis.
Available in stud or universal mount, double, single, or reverse acting, and with rotating or non-rotating rod.
Every hexagonal structure on the sheet surface acts like a single mirror.

In science:

By using a Mellin-Barnes type integral representation and analytic continuation we can reduce our Fredholm determinant to that of an operator acting on a single contour.
Free energy fluctuations for directed polymers in random media in 1+1 dimension
A single board computer (GE Intelligent Platforms V7865) acting as VME master is used for the data acquisition.
The MIDAS telescope for microwave detection of ultra-high energy cosmic rays
Effective Hamiltonian We now detail how the terms of the Hamiltonian act on a single spinon state |ii.
Localization of spinons in random Majumdar-Ghosh chains
From this equation it is clear that the irreducible selfenergy acts as an effective potential for a single particle and takes into account the interactions of the particle with the medium.
Faddeev Random Phase Approximation applied to molecules
We shall suppose, the migration runs as a single act, entirely, and the reproduction always follows the migration.
The simplest model of spatially distributed population with reasonable migration of organisms