• WordNet 3.6
    • v intrude thrust oneself in as if by force "The colors don't intrude on the viewer"
    • v intrude enter uninvited "They intruded on our dinner party","She irrupted into our sitting room"
    • v intrude search or inquire in a meddlesome way "This guy is always nosing around the office"
    • v intrude enter unlawfully on someone's property "Don't trespass on my land!"
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: Spiral staircases in medieval castles are running clockwise. This is because all knights used to be right-handed. When the intruding army would climb the stairs they would not be able to use their right hand which was holding the sword because of the difficulties of climbing the stairs. Left-handed knights would have had no troubles, except left-handed people could never become knights because it was assumed that they were descendants of the devil
    • Intrude (Geol) The cause to enter or force a way, as into the crevices of rocks.
    • Intrude To enter by force; to invade. "Why should the worm intrude the maiden bud?"
    • v. i Intrude To thrust one's self in; to come or go in without invitation, permission, or welcome; to encroach; to trespass; as, to intrude on families at unseasonable hours; to intrude on the lands of another. "Thy wit wants edge
      And manners, to intrude where I am graced."
      "Some thoughts rise and intrude upon us, while we shun them; others fly from us, when we would hold them."
    • Intrude To thrust or force (something) in or upon; especially, to force (one's self) in without leave or welcome; as, to intrude one's presence into a conference; to intrude one's opinions upon another.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: In order to scare away predators, Giant petrels, a type of seabird, throw up all over the intruder
    • intrude To thrust in; bring in forcibly.
    • intrude To thrust or bring in without necessity or right; bring forward unwarrantably or inappropriately: often used reflexively.
    • intrude To push or crowd in; thrust into some unusual, improper, or abnormal place or position: as, intruded rocks or dikes in a geological formation. In entomology an intruded part or organ is one that is nearly concealed in a hollow of the supporting parts, only the apex being visible.
    • intrude To enter forcibly; invade.
    • intrude To come or appear as if thrust in; enter without necessity or warrant; especially, to come in unbidden and unwelcomely: as, to intrude upon a private circle; to intrude where one is not wanted.
    • intrude Synonyms Encroach upon, Infringe upon, etc. See trespass, v. i. Intrude, Obtrude. The essential difference between these words lies in the prepositions: intrude, to thrust one's self into places, invading privacy or private rights; obtrude, to thrust one's self out beyond modesty or the limits proper to ourselves, and offensively against the attention, etc., of others.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: An adult lion's roar can be heard up to five miles away, and warns off intruders or reunites scattered members of the pride.
    • v.i Intrude in-trōōd′ to thrust one's self in: to enter uninvited or unwelcome
    • v.t Intrude to force in
    • ***


  • Epicurus
    “Misfortune seldom intrudes upon the wise man; his greatest and highest interests are directed by reason throughout the course of life.”


Webster's Revised Unabridged Dictionary
L. intrudere, intrusum,; pref. in-, in + trudere, to thrust, akin to E. threat,. See Threat


In literature:

My own tears flowed in unison; but I drew back, feeling as if it were sacrilege to intrude on such a scene.
"Ernest Linwood" by Caroline Lee Hentz
I feel as though I've intruded on very private property.
"Grace Harlowe's Golden Summer" by Jessie Graham Flower
The business note hardly intruded on the proceedings at all.
"Jill the Reckless" by P. G. (Pelham Grenville) Wodehouse
Andy stared at the intruder for an instant, and then turned again to the girl lying unconscious upon the body of her father.
"The Secret of the Storm Country" by Grace Miller White
Evidently, he had intruded on the latter end of a long and luxurious revel.
"The Complete Prose Works of Martin Farquhar Tupper" by Martin Farquhar Tupper
Dave did so, but the other five chums kept their gaze steadily on the unwelcome intruder.
"The Grammar School Boys Snowbound" by H. Irving Hancock
I didn't mean to intrude, but he's such a dear little boy I couldn't help being sympathetic.
"Campfire Girls at Twin Lakes" by Stella M. Francis
But Manasseh still stood regarding him fixedly, and the intruder yielded without a word.
"Manasseh" by Maurus Jokai
Paul thought that the time was about ripe to give these intruders the surprise of their lives.
"The Banner Boy Scouts on a Tour" by George A. Warren
When Walt chances to be indoors, he has companion of his own, which hinder him from too frequently intruding upon his comrade.
"The Lone Ranche" by Captain Mayne Reid

In poetry:

Hence intruder, most distressing,
Seek the happy and the free:
The wretch who wants each other blessing,
Ever wants a friend in thee.
"The Captivity" by Oliver Goldsmith
I to the woodland solitude will bend
My lonesome way—where Mirth's obstreperous shout
Shall not intrude to break
The meditative hour.
"On Whit-Monday" by Henry Kirke White
Yet why should thoughts like these intrude to scare
The vagrant Happiness, when she will deign
To smile upon us here,
A transient visitor?
"On Whit-Monday" by Henry Kirke White
O what a struggle wakes within
When, in the spirit's solitude,
The tempting, treach'rous thoughts of sin
In all their luring smiles intrude!
"Temptation" by John Bowring
VII. Fear not to meet intruders there,
Thou'lt only find my harp and me,
Breathing perhaps some pensive song,
And waiting anxiously for thee.
"The Boudoir" by Sydney Owenson
While these a constant revel keep,
Shall Reason only teach to weep?
Hence, intruder! We'll pursue
Nature, a better guide than you.
"The Captivity" by Oliver Goldsmith

In news:

(AP) — Rochester police say a grandfather shot and critically wounded his teenage granddaughter after mistaking her for an intruder.
Drunken intruder leads to high speed chase.
Conditions at Colorado Springs, CO. A Pueblo homeowner is recovering after intruders broke into his home and shot him.
Intruder attacks homeowner , steals money and car.
Owasso homeowner fatally shoots intruder, police say.
A Grand Prairie homeowner was on the phone with 911 operators when he shot a knife-wielding intruder who was later identified as a neighbor, police said.
A man who allegedly killed two intruders tells Minnesota police he fired "more shots than I needed to.".
Homeowner charged in deaths of 2 intruders.
Two intruders shot to death Thursday by a Puyallup homeowner have not yet been identified.
Homeowner recounts how he shot intruder.
On Oct 13, Black shot and killed an intruder who broke into the family's home.
Interpreting SC law on homeowners shooting intruders.
Two women sexually assaulted by armed intruder .
Retired SC trooper kills intruder at Bluffton home.

In science:

We now present the solution to the minimax game between the collection of mobile sensors and the intruder in the following theorem.
Dynamic Coverage of Mobile Sensor Networks
For the game between the collection of mobile sensors and the intruder, the optimal sensor strategy is for each sensor to choose a direction according to a uniform distribution, i.e., fQ (q) = 1 2p .
Dynamic Coverage of Mobile Sensor Networks
The optimal mobility strategy of the intruder is to stay stationary.
Dynamic Coverage of Mobile Sensor Networks
For sensors, minimizing intruder detection time is equivalent to maximizing the effective sensor speed after an intruder selects the optimal speed and direction.
Dynamic Coverage of Mobile Sensor Networks
Based on the previous discussions on different mobility strategies of sensors and intruders, under the derived optimal mobility strategies, neither side can improve the payoff by changing the strategy unilaterally.
Dynamic Coverage of Mobile Sensor Networks