• WordNet 3.6
    • n interloper someone who intrudes on the privacy or property of another without permission
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Webster's Revised Unabridged Dictionary
    • n Interloper One who interlopes; one who unlawfully intrudes upon a property, a station, or an office; one who interferes wrongfully or officiously. "The untrained man, . . . the interloper as to the professions."
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Century Dictionary and Cyclopedia
    • n interloper One who trades without license.
    • n interloper One who interferes obtrusively or officiously; one who thrusts himself into a station to which he has no claim, or into affairs in which he has no interest.
    • ***
Chambers's Twentieth Century Dictionary
    • n Interloper in-tėr-lōp′ėr one who trades without license: an intruder
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  • Joseph Conrad
    “The East Wind, an interloper in the dominions of Westerly Weather, is an impassive-faced tyrant with a sharp poniard held behind his back for a treacherous stab.”


Webster's Revised Unabridged Dictionary
Pref. inter-, + D. looper, a runner, fr. loopen, to run; akin to E. leap,. See Leap, and cf. Elope
Chambers's Twentieth Century Dictionary
Dut. enterlooper, a smuggling vessel, as running in and out along the coast—L. inter, between, Dut. loopen, to run. See Leap.


In literature:

But we were told, that the Northern men were interlopers and intruders amongst us.
"The Trial of Reuben Crandall, M.D. Charged with Publishing and Circulating Seditious and Incendiary Papers, &c. in the District of Columbia, with the Intent of Exciting Servile Insurrection." by Unknown
But I have been an interloper from the beginning, and I do not see how I could have remained.
"Aladdin of London" by Sir Max Pemberton
The capitalist is as unnecessary as any other kind of thief or interloper.
"British Socialism" by J. Ellis Barker
But then Dick never liked interlopers.
"Not Like Other Girls" by Rosa N. Carey
The laws of Virginia were very strict against interlopers on the Potomac.
"From Farm House to the White House" by William M. Thayer
Isabel was your dearest friend; and I was a new-comer, an interloper.
"In the High Valley" by Susan Coolidge
And he considers us interlopers.
"The Girls of Central High in Camp" by Gertrude W. Morrison
At that sight Peter felt himself out of place, an intruder, an interloper.
"Peter the Brazen" by George F. Worts
Chuck every interloper over the bank.
"The Tale of Timber Town" by Alfred Grace
Evidently the leading men were aliens and interlopers.
"Literary Tours in The Highlands and Islands of Scotland" by Daniel Turner Holmes

In poetry:

The last remains of "Turk" lie here,
Who ne'er was known to shrink, or fear
The face of interloper;
Poor "Turk" was ever, soon or late,
From puppy up to dog's estate,
A foe to thief or loafer.
"An Epitaph On My Dog Turk" by Benjamin Cutler Clark

In news:

Most of the subs tried their best, but I liked my teachers and treated their temporary replacements as interlopers.
WILD Atlantic salmon returning to spawn in the freshwater streams of their birth now face a startling threat: interlopers.
Halley 's as Interloper.
NEW observations of the chemical composition of Halley 's comet suggest that the illustrious traveler through the solar system may be an interloper from deep space, astronomers have reported.
Football Dads Pummel Shirtless, Saggy-Pantsed Interloper on Field At High School Game.
Melynda Price is an associate professor at the University of Kentucky College of Law and blogs at Thoughts of an Ivory Tower Interloper.
All have their little quirks that make interlopers stick out like sore thumbs.
The invasion of the Cuban treefrog is a case study in what happens when an interloper that is a prolific breeder enters a new environment through human commercial activity.
When the Fante reading ends , the interlopers quickly disperse.
The jets intercepted the interloping aircraft and followed it, without incident, until it landed around at approximately 9:50 am where it was greeted by local law enforcement.
As a male, I was clearly an interloper.
Wilson's second novel (after Interloper) is fresh and flawlessly crafted as well as charmingly genuine.
As in The Interloper, the uniformity of the confessional point of view becomes a liability instead of an asset, reducing Wilson's would-be panoramas to a pinprick hint of light.
Feeling like a Hip Hop interloper, I did not want to go.
This reaction did not go appreciated by Park Slope parents, and now, the keepers of the listserv have put a kibosh on any more discussion of the frozen dairy treats and their interloping purveyors.

In science:

Note that the definition of an interloper used here is very strict and many galaxies classified as interlopers actually belong to the (non-spherical) large-scale structure associated with the cluster.
Cluster Galaxies Die Hard
The diffusion time and interaction with resonances make it possible for interlopers to appear close to the family dynamically, so it is essential to have both dynamical and physical properties characterisation to con firm family membership [ Cellino et al., 2002].
Characterisation of candidate members of (136108) Haumea's family
We first wish to determine which candidates are actually family members, and which are dynamical interlopers with different surface properties.
Characterisation of candidate members of (136108) Haumea's family
We reject the other 8 candidates observed with Hawk-I as interlopers which lack water ice absorption.
Characterisation of candidate members of (136108) Haumea's family
However, 8% of the observed structures are partially assembled with two galaxies in the same halo, meaning that we are observing groups with interlopers.
Proto-groups at 1.8 ***