# interference

## Definitions

• WordNet 3.6
• n interference (American football) blocking a player's path with your body "he ran interference for the quarterback"
• n interference the act of hindering or obstructing or impeding
• n interference any obstruction that impedes or is burdensome
• n interference a policy of intervening in the affairs of other countries
• n interference electrical or acoustic activity that can disturb communication
• ***
Webster's Revised Unabridged Dictionary
• Interesting fact: The destruction of the Berlin Wall began when private citizens began to demolish entire sections of the Wall without interference from government officials on November 9, 1989
• Interference (Patent Law) The act or state of interfering, or of claiming a right to the same invention.
• Interference The act or state of interfering; as, the stoppage of a machine by the interference of some of its parts; a meddlesome interference in the business of others.
• Interference (Physics) The mutual influence, under certain conditions, as from streams of light, or pulsations of sound, or, generally, two waves or vibrations of any kind, producing certain characteristic phenomena, as colored fringes, dark bands, or darkness, in the case of light, silence or increased intensity in sounds; neutralization or superposition of waves generally.
• ***
Century Dictionary and Cyclopedia
• Interesting fact: The difference between AM and FM radio is that FM is line-of-sight, while AM bounces off the atmosphere (more accurately, the ionosphere.) AM stations have to reduce the power of their transmissions at night because the ionosphere lifts with the colder temperatures and lees solar interference.
• n interference The act of interfering; interposition; especially, intermeddling.
• n interference A clashing or collision; the act of coming into violent contact.
• n interference In farriery, a striking of one foot against the one next to it, as one hind foot against the other.
• n interference In Amer. patent law, the conflict between two patents or applications for patent which claim in whole or in part the same invention. Hence, to go into interference (of an application for a patent) is to be reserved for the purpose of litigating the question in the patent office before the application shall be granted.
• n interference In physics, the mutual action of waves of any kind (whether those in water, or sound-, heat-, or light-waves) upon one another, by which, under certain conditions, the vibrations and their effects are increased, diminished, or neutralized. The term was first employed by Dr. Young to express certain phenomena which result from the mutual action of the rays of light ou one another. In general, if two systems of waves come together, they interfere—that is, they unite to reinforce or destroy one another, the actual disturbance of the medium at any instant being the resultant of the two disturbances considered separately. For example, if the two systems are of equal intensity and in the same phase, the result will be a doubled disturbance; if, however, they are half a wave-length apart, the result will be rest. Thus, two sounds of the same pitch and intensity produce a note of double the intensity when they meet in the same phase, the point of condensation of one corresponding to that of the other; when, on the other hand, the point of maximum condensation of the first corresponds to that of rarefaction of the other, they destroy each other. Again, if two notes differing but slightly in pitch (say one vibration per second) are sounded together, there will be one instant in each second when the two wave-systems will nearly coincide in phase, and one when they will be half a wave-length apart; the result is that they alternately strengthen and weaken each other at these moments, and the ear perceives the pulsations in the note called beats (see beat, 7). The same principles hold true in the case of light, as was first shown by Young. The interference of light-waves is illustrated by the phenomena of diffraction (see diffraction): thus, a diffraction grating gives with monochromatic light a series of light and dark bands (interference fringes), corresponding respectively to the points of maximum and minimum motion resulting from the mutual action of the two wave-systems; for the former they are iu the same phase, for the latter they differ in phase by half a wave-length. If white light is employed, a series of spectra (interference spectra) of different orders is obtained. Newton's rings, obtained, for example, when ordinary light is reflected from a convex lens of long focus pressed upon a plate of glass, are circular interference spectra. The colors of thin films, as of oil on water or of a soap-bubble, are due to interference, as is also the iridescence of some antique glass or of mother-of-pearl. Still again, the beautiful figures produced when a section of a uniaxial crystal cut normal to the axis, or of a biaxial crystal cut normal to the bisectrix, is viewed in converging polarized light are similar phenomena, and are hence called interference figures. Recently (1888–9) Hertz has shown that electric waves, produced, for example, by induction discharges between two metal surfaces and propagated through space, also exhibit under proper conditions interference phenomena. These waves may have a length of several feet. See wave.
• n interference In base-ball and foot-ball, the act of interfering. See interfere, v. i., 5 and 6.
• ***

## Quotations

• Eric Berne
“Each person designs his own life, freedom gives him the power to carry out his own designs, and power gives the freedom to interfere with the designs of others.”
• Brooks Atkinson
“I have no objections to churches so long as they do not interfere with God's work.”
• Mark Twain
“I have never let my schooling interfere with my education.”
• Paul Twitchell
“The higher one climbs on the spiritual ladder, the more they will grant others their own freedom, and give less interference to another's state of consciousness.”
• Howard Dietz
“Composers shouldn't think too much -- it interferes with their plagiarism.”
• John Wooden
“Do not let what you cannot do interfere with what you can do.”

## Etymology

Webster's Revised Unabridged Dictionary
See Interfere

## Usage

### In literature:

I am noways authorized to interfere with the money matters of the United States in Europe.
"The Writings of Thomas Jefferson" by Thomas Jefferson
Therefore no case for interference.
"The Life of William Ewart Gladstone, Vol. 1 (of 3)" by John Morley
The vessels at the root of the neck are probably to be regarded from the same point of view, as to surgical interference.
"Surgical Experiences in South Africa, 1899-1900" by George Henry Makins
They mean interference with nourishment and prevent proper action of the lymphatic system, as adenoids prevent free breathing.
"Civics and Health" by William H. Allen
In other cases, however, there develops marked interference with breathing.
"The Eugenic Marriage, Volume IV. (of IV.)" by Grant Hague
I never allow anything to interfere with my magisterial duties.
"Dick Cheveley" by W. H. G. Kingston
We are travellers bound to Cork, not wishing to interfere with you or any one else.
"Paddy Finn" by W. H. G. Kingston
This is due to the pressure of the womb, which interferes with the circulation.
"Woman" by William J. Robinson
Would she not interfere with him?
"Kept in the Dark" by Anthony Trollope
Miss Reid won't dare interfere with sports this year.
"Marjorie Dean, College Sophomore" by Pauline Lester
***

### In poetry:

And, in conclusion, I'd have him to beware,
And never again to interfere with a poet's hair,
Because Christ the Saviour wore long hair,
And many more good men, I do declare.
"Lines in Reply to the Beautiful Poet Who Welcomed News of McGonagall's Departure from Dundee" by William Topaz McGonagall
Prayer will force the Deity, to hear
Its plaints — and Christ, its doleful cause to plead —
Prayer will make the Spirit interfere,
With sighs and groans for it to intercede.
"Concerning Prayer, And Its Proper Requisites" by Rees Prichard
PRET. That's all very well, but I can't throw myself into a part
that has already lasted a twelvemonth, when I have to make love
to my father. It interferes with my conception of the
characters. It spoils the part.
"Thespis: Act II" by William Schwenck Gilbert
"Me life's me own!" she sez. "You got a nerve --
You two -- to interfere in my affairs.
Git out an' give advise where it may serve:
Stay 'ome an' bleat yer pray'rs.
Did I come pleadin' for yer pity? No!
Well, why not go?"
"Rose" by C J Dennis
And if some Preservationist attempts to interfere
A 'dangerous structure' notice from the Borough Engineer
Will settle any buildings that are standing in our way -
The modern style, sir, with respect, has really come to stay.
"Executive" by Sir John Betjeman
Not for any beast that burrows, not for any bird that flies,
Would I lose his large sound council, miss his keen amending eyes.
He is bailiff, woodman, wheelwright, field-surveyor, engineer,
And if flagrantly a poacher—'tain't for me to interfere.
"The Land" by Rudyard Kipling

### In news:

The mayor is asking city council to approve a checklist to make sure the construction of seawalls - doesn't interfere with the fish's habitat.
When Self-Importance Interferes With the Music.
Man interferes with Romney's motorcade, arrested.
Battling cancer is a difficult struggle on its own, but when the side effect s of the treatment interfere with quality of life, simple, everyday tasks can become a challenge.
A simmering standoff interferes with school needs.
As a result, with the newly-developed equipment, simultaneous measurement is possible by positioning the electrodes used to collect electrons in close proximity to the specimen not to interfere with reflection measurements.
Saed Hindash/The Star-Ledger St Benedict's and guard Myck Kabongo won't be competing in a national tournament in the coming weeks because its schedule interferes with Good Friday.
But will this intensive training interfere with my ability to get pregnant.
Question #8 With the Wi-Fi, how do you substantiate the interference with the other systems in the aircraft.
Starting about 1890, politicians began to interfere with that process, usually to serve their ends of the ends of cronies.
That's what many Chinese people believe their country is doing: moving slowly in introducing democracy in order not to interfere with the mad dash to capitalism .
Medical experts have known for years that some citrus, specifically grapefruit, can interfere with some medications.
Weather Gods Interfere in the Campaign -- and the Left Prays the Storm Helps Obama.
Clayton Osbon was charged with interference with a flight crew for his behavior on the March 27 flight from New York to Las Vegas.
Calcium supplements may interfere with some medications, so make sure to check with your healthcare provider before starting a regular supplement plan.
***

### In science:

In the radio domain OAM can also be used to create multiple information channels, all using the same frequency but different l so that they, ideally, do not interfere with each other (generalized Fresnel-Arago interference laws).
Angular Momentum of Electromagnetic Radiation. Fundamental physics applied to the radio domain for innovative studies of space and development of new concepts in wireless communications
In this case, transmitters reduce the mutual interference and only overcome the interference of transmitters sharing the same channel.
On the Benefits of Bandwidth Limiting in Decentralized Vector Multiple Access Channels
To rigorously use the LF description for diffraction and interference, the interference term should be included.
Augmenting Light Field to model Wave Optics effects
Then these interference terms cancel out leaving only the color-allowed tree-penguin interference term in the sum of Γ(B− → K −π0 ) and Γ( ¯B 0 → ¯K 0π0 ).
$B\to K\pi$ decays
It is usual in Physics to keep an apparatus as isolated as possible from all known interference, but any interference that cannot be removed is, as far as possible, measured and corrected for.
An empirically equivalent random field for the quantized electromagnetic field
***