r
the theoretical intrinsic rate of increase of a population, equivalent to the difference between the birth and death rates divided by the number of individuals in the population.
r
1 AmericanEcology.
r
2
American
R
3
American
[ahr]
/ ɑr /
Or
r
noun
-
R's,
plural
-
Rs,
plural
-
r's,
plural
-
rs
plural
-
the 18th letter of the English alphabet, a consonant.
-
any spoken sound represented by the letter R or r, as in ran, carrot, or rhyme.
-
something having the shape of R .
-
a written or printed representation of the letter R or r.
-
a device, as a printer's type, for reproducing the letter R or r.
R
4
American
[ahr]
/ ɑr /
verb
R
5
American
abbreviation
R
6
American
abbreviation
-
Chemistry. radical.
-
Mathematics. ratio.
-
regular: a man's suit or coat size.
-
Electricity. resistance.
-
Theater. stage right.
-
Physics. roentgen.
-
Chess. rook.
R
7
American
Symbol.
-
the 18th in order or in a series.
-
(sometimes lowercase) the medieval Roman numeral for 80.
-
Biochemistry. arginine.
-
Physics. universal gas constant.
-
registered trademark: written as superscript ® following a name registered with the U.S. Patent and Trademark Office.
r.
8
American
abbreviation
-
rs
plural
-
rabbi.
-
railroad.
-
railway.
-
range.
-
rare.
-
Commerce. received.
-
recipe.
-
replacing.
-
residence.
-
right.
-
rises.
-
river.
-
road.
-
rod.
-
royal.
-
rubber.
-
ruble.
-
Baseball. run; runs.
-
rupee.
R.
9
American
Or
R.
abbreviation
R.
10
American
abbreviation
-
rabbi.
-
Radical.
-
radius.
-
railroad.
-
railway.
-
(in South Africa) rand; rands.
-
Réaumur.
-
rector.
-
redactor.
-
regina.
-
Republican.
-
response.
-
rex.
-
river.
-
road.
-
royal.
-
ruble.
-
rupee.
-
Theater. stage right.
r
1
British
/ ɑː /
noun
-
the 18th letter and 14th consonant of the modern English alphabet
-
a speech sound represented by this letter, in English usually an alveolar semivowel, as in red
-
See three Rs
r.
2
British
abbreviation
-
rare
-
recto
-
Also: r. rod (unit of length)
-
ruled
-
cricket baseball run(s)
R.
3
British
abbreviation
-
rabbi
-
rector
-
Regina
-
Republican
-
response (in Christian liturgy)
-
Rex
-
River
-
Royal
R.
4
British
abbreviation
-
registered (trademark)
-
right
-
river
-
rouble
R
5
British
symbol
-
chem radical
-
currency
-
rand
-
rupee
-
-
Réaumur temperature (scale)
-
physics electronics resistance
-
roentgen or röntgen
-
chess rook
-
Royal
-
chem gas constant
-
-
restricted exhibition (used to describe a category of film certified as unsuitable for viewing by anyone under the age of 18)
-
( as modifier )
an R film
-
r
Scientific
R
Idioms
Other Word Forms
Noun Inflected Forms
Etymology
Origin of R5
An American designation established in 1968
Origin of R.9
From the Latin word recipe
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
For two masses, m1 and m2, scientists multiply the masses together, divide that result by the square of the distance r between them, and then multiply by big G.
From Science Daily ● Sep. 20, 2026
Mark Joseph Stern: This idea of republican virtue, lowercase r, civic virtue, the Framers were obsessed with it.
From Slate ● Aug. 17, 2026
In June 2018, Sampath allegedly texted Peng asking, “What r the other opportunities in Lausd. That we can exploit. Any other area.”
From Los Angeles Times ● Mar. 27, 2026
“Nancy, you r loved and our angel,” says another.
From The Wall Street Journal ● Feb. 16, 2026
Annie turned ten on March r, Emma gave her a book.
From "Charles and Emma: The Darwins' Leap of Faith" by Deborah Heiligman
R “Ray” Wang, founder and chairman of Constellation Research, said that while some AI developers may not survive, capacity will still be needed.
From The Wall Street Journal ● Nov. 2, 2026
It has done ads for Virgin and Toys R Us.
From Los Angeles Times ● Oct. 17, 2026
She describes the purpose of the visit as an "off-site meetings with Mr K R Murdoch and other senior executives from News Corp and News UK".
From BBC ● Sep. 23, 2026
The Multistrada is typically shopped against the equally intrepid BMW R 1300 GS; and KTM’s 1390 Super Adventure.
From The Wall Street Journal ● Aug. 29, 2026
The letter R was the last to go, it twisted in the flame, it curled outwards for a moment, becoming larger than ever.
From "Rebecca" by Daphne du Maurier
For Chicago, Sharon chose avery r. young, a Chicago-born Black poet, composer and activist.
From Washington Times ● Apr. 28, 2021
By tracking only bats collected from N. r. elongata pitchers, he says, Grafe's team may have missed individuals that used other roosting spots and overestimated the importance of pitchers to the species as a whole.
From Science Magazine ● Jan. 26, 2011
Now a professor at the Royal Roads University in Victoria, Canada, he says he, too, happened upon a couple of bats nestled in N. r. elongata pitchers, but he "never put two and two together."
From Science Magazine ● Jan. 26, 2011
Reported by Jay Branegan/Chicago The Post spurns p. r. "wolves" Reporters often rely on publicists to alert them to stories, but customarily dismiss the public relations trade as "flackery."
From Time Magazine Archive
She erected a big white sign in the front yard on which she had carefully painted, in black letters with gold outlines, r. m. walls art studio.
From "The Glass Castle" by Jeannette Walls
The Lincoln is not the only American carrier to face issues during a lengthy time at sea: the USS Gerald R. Ford also suffered various problems during a recent 326-day deployment.
From Barron's ● Oct. 7, 2026
That unexpected path from military clothing research to agriculture demonstrates the value of collaboration across scientific fields, said co-author R. Michael Roe, William Neal Reynolds Distinguished Professor at NC State.
From Science Daily ● Oct. 1, 2026
Holding court at the George R. Brown Convention Center in Houston, the brokerage’s executives unveiled a slew of new tools and services.
From The Wall Street Journal ● Sep. 29, 2026
Series creator R. Scott Gemmill accepted the award, with several members of the cast and crew on stage behind him.
From Los Angeles Times ● Sep. 15, 2026
They are all the same—all addressed to R. M. Wildsmith, all from the Getty Publishing Group.
From "How to Disappear Completely" by Ali Standish
Also, a radical idea: “We need to ensure that our students are graduating with the right grade level skills of the 4 R’s: reading, writing, arithmetic, and reasoning.”
From Slate ● Feb. 5, 2024
The R's then seized the initiative, with Chair's introduction in place of the injured Jack Colback giving them extra impetus.
From BBC ● Dec. 1, 2023
You’re in such a unique position because vintage dealers are often checking off each box in the three R’s of recycling: reduce, reuse, recycle.
From Los Angeles Times ● Oct. 10, 2023
“We appreciate the seriousness with which the panel of inquiry undertook to investigate irregularities surrounding the Lady R’s presence in South Africa in December 2022,” David S. Feldmann, a spokesperson at the U.S.
From Seattle Times ● Sep. 6, 2023
Her accent is more pronounced, with the T’s and R’s harder, so I can tell she’s getting annoyed.
From "A Place at the Table" by Saadia Faruqi and Laura Shovan
To go American, Mielewska said it's all about getting the Rs and the vowels right.
From Barron's ● Mar. 5, 2026
According to the team, the foundation of a circular space economy lies in the 3 Rs: reduce, reuse, and recycle.
From Science Daily ● Dec. 3, 2025
There are plenty of Rs in the mix, and we’re glad to have new allies.
From The Wall Street Journal ● Nov. 25, 2025
My 4-year-old grandson can count the three Rs in strawberry.
From MarketWatch ● Nov. 3, 2025
The gravelly voice spoke her name like a native Spanish speaker would, a light roll of the Rs leading into the clipped A. It didn’t matter.
From "Shadowshaper" by Daniel José Older
Around this time, AI tools were still famously bad at answering one math question that wouldn’t appear on any standardized test: How many r’s are in the word strawberry?
From The Wall Street Journal ● Oct. 24, 2026
Leto’s grumbling Brit-inflected baritone is an unrecognizable concoction of trilled r’s and plummy vowels — and the best performance he’s done in years.
From Los Angeles Times ● Jun. 3, 2026
Her accent clipped off the final r's, making the words come out "remembah" and "ovah."
From Salon ● Jun. 19, 2023
Ms. Walters, who died Dec. 30 at her home in New York, according to ABC, spent the following decades overcoming her mangled r’s and became one of television’s premier interrogators of the newsworthy.
From Washington Post ● Dec. 30, 2022
Tata Ndu turned directly to Father and spoke to him in surprisingly careful English, rolling his r’s, placing every syllable like a stone in a hand.
From "The Poisonwood Bible" by Barbara Kingsolver
There's a lot of spoken dialogue and I was doing my best to not sound too horribly American - - to soften my rs and elongate my vowels.
From The Guardian ● Oct. 8, 2012
His farewell is unique among the oth rs all around him for its detachment.
From Time Magazine Archive
Morgan Stanley and Goldman, Sachs will each get $4 million for their work in fine-tuning the financial details of the Chemical-Manufacture rs Hanover deal.
From Time Magazine Archive
Two years ago Promoter Vandeburg talked Fair managers into selling their Big Show rs a peg on which to hang a national campaign of travel to eleven far-western States instead of merely plugging San Francisco.
From Time Magazine Archive
Then came the Old Bear with the main force, Ser Mallador Locke with the baggage train and packhorses, and finally Ser Ottyn Wythe rs and the rear guard.
From "A Clash of Kings" by George R.R. Martin
Random Word
Spin the wheel and learn a new word!
Get a wordDefinitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
