• WordNet 3.6
    • v pigeonhole treat or classify according to a mental stereotype "I was stereotyped as a lazy Southern European"
    • v pigeonhole place into a small compartment
    • n pigeonhole a small compartment
    • n pigeonhole a specific (often simplistic) category
    • ***
Webster's Revised Unabridged Dictionary
    • n Pigeonhole A small compartment in a desk or case for the keeping of letters, documents, etc.; -- so called from the resemblance of a row of them to the compartments in a dovecote.
    • v. t Pigeonhole To place in the pigeonhole of a case or cabinet; hence, to put away; to lay aside indefinitely; as, to pigeonhole a letter or a report.
    • ***
Century Dictionary and Cyclopedia
    • n pigeonhole One of the holes in a dove-cote or pigeon-house through which the birds pass in and out.
    • n pigeonhole Hence A little compartment or division in a case for papers, a bureau, a desk, or the like.
    • n pigeonhole One of a series of holes in an arch of a furnace through which the gases of combustion pass.
    • n pigeonhole One of a series of holes in the block at the bottom of a keir through which its liquid contents can be discharged.
    • n pigeonhole plural An old English game, resembling modern bagatelle, in which balls were rolled through little cavities or arches.
    • n pigeonhole In printing, an over-wide space between printed words. Also called rat-hole.
    • pigeonhole To place or file away in a pigeonhole; hence, to lay aside for future consideration; hence, to lay aside and ignore or forget; “shelve”; treat with intentional neglect: as, to pigeonhole an application for an appointment; to pigeonhole a scheme.
    • ***


In literature:

He belongs to no class, evades the label, and fits into no pigeonhole.
"Little Journeys to the Homes of the Great, Vol. 13" by Elbert Hubbard
His offer was smilingly pigeonholed.
"Little Journeys to the Homes of the Great, Volume 11 (of 14)" by Elbert Hubbard
So we had a postmistress and a post office, with its tiers of empty, homemade pigeonholes ready to receive the mail.
"Land of the Burnt Thigh" by Edith Eudora Kohl
Then, taking an envelope from one of her pigeonholes, she turned to the expectant girl.
"A Patriotic Schoolgirl" by Angela Brazil
She sat down at the writing-table and took from a pigeonhole a sheaf of tradesmen's bills.
"The Creators" by May Sinclair
Drawers, pigeonholes, shelves, were all searched in vain.
"How I Know God Answers Prayer" by Rosalind Goforth
We will place him in his proper pigeonhole in our arrangement of the record of human progress.
"Progress and History" by Various
He took Lupin into his study, a large, three-windowed room, lined with book-cases, sets of pigeonholes, an American desk and a safe.
"The Confessions of Arsène Lupin" by Maurice Leblanc
I could make a square or pigeonhole corner or lay out a brick footing.
"One Way Out" by William Carleton
Between the two upper ones partitions are glued in to form pigeonholes.
"Social Life" by Maud C. Cooke

In news:

With a name as ridiculously awesome as Guantanamo Baywatch, it might seem easy to pigeonhole a band.
Building a Better Pigeonhole A journalism professor examines why all Americans fit into one of 62 categories.
Female GOP rep not easy to pigeonhole .
Female GOP rep not easy to pigeonhole.
Keith Morris refuses to be pigeonholed.
But I don't want to be pigeonholed as a racist or just a "black writer".
(April 19, 2012) Peter Mulvey is a guy with a guitar, and while it's easy to pigeonhole him as another singer/songwriter in the folk tradition, that doesn't do him justice.
Fox, Walden Media, though, also are trying not to pigeonhole the film as just something that will appeal to the 2.2 billion Christians in the world -- but to the other 4.7 billion as well.
PALESTINE has a special pigeonhole in the memories of the great majority of us.
Each of London's big four film vfx houses has its own strengths, but tries not to get pigeonholed.
Chaz Bundick shouldn't worry about being pigeonholed anymore.
NYT coverage of suicide a shallow attempt to pigeonhole.
The actor costars in 'The Perks of Being a Wallflower' but worries about being pigeonholed, especially after self-identifying as 'queer.'.
Influenced by all types of musical genres , his sound is hard to pigeonhole.
" And when one is married to one of the most famous photographers in history (Henri Cartier-Bresson), she risks being pigeonholed as her "husband's wife.

In science:

By the pigeonhole principle, there thus exists b ∈ aG such that |{g ∈ A : g−1ag = b}| ≫ K −O(1) |A|dim(Z (a))/ dim(G) .
Approximate subgroups of linear groups
Thus, by the pigeonhole principle, we can find an element g of A · (A6 ∩ ˜T ) which has ≫ K −O(1) |A|dim(T )/ dim(G) representations of the form g = at, where a ∈ A and t ∈ A6 ∩ ˜T .
Approximate subgroups of linear groups
By the pigeonhole principle, one of the sets Zj , say Z1 , contains an infinite subsequence 2ls of the sequence k = 2l of iterations.
Conley Conjecture for Negative Monotone Symplectic Manifolds
We find a general, algebraic framework in which we isolate an abstract pigeonhole principle and prove that it implies a precise version of the above abstract Ramsey-type statement.
Abstract approach to finite Ramsey theory and a self-dual Ramsey theorem
As already mentioned, the Graham–Rothschild theorem plays the role of the pigeonhole principle in the proof of this theorem.
Abstract approach to finite Ramsey theory and a self-dual Ramsey theorem