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.
THIS PSAT VOCABULARY QUIZ IS PERFECT PRACTICE FOR THE REAL TEST
In our third teacher-created PSAT practice test there are new and unique vocabulary terms you may have never heard of! Can you guess what they mean?
Question 1 of 10
Also called Malthusian parameter .
Definition for r (2 of 10)
Definition for r (3 of 10)
[ ahr ]
/ ɑr /
noun, plural R's or Rs, r's or rs.
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.
Definition for r (4 of 10)
[ ahr ]
/ ɑr /
Informal. are: Oysters R in season.
Definition for r (5 of 10)
Trademark. restricted: a rating assigned to a movie by the Motion Picture Association of America indicating that children under the age of 17 will not be admitted to a theater showing the film unless accompanied by an adult.
Origin of R3
An American designation established in 1968
Definition for r (6 of 10)
regular: a man's suit or coat size.
Theater. stage right.
Definition for r (7 of 10)
Definition for r (8 of 10)
Baseball. run; runs.
plural rs. rupee.
Definition for r (9 of 10)
(in prescriptions) take.
Origin of R.1
From the Latin word recipe
Definition for r (10 of 10)
(in South Africa) rand; rands.
Theater. stage right.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
British Dictionary definitions for r (1 of 5)
/ (ɑː) /
noun plural r's, R's or Rs
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
British Dictionary definitions for r (2 of 5)
Réaumur temperature (scale)
physics electronics resistance
roentgen or röntgen
chem gas constant
(in the US and Australia)
- 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
British Dictionary definitions for r (3 of 5)
Also: r rod (unit of length)
cricket baseball run(s)
British Dictionary definitions for r (4 of 5)
British Dictionary definitions for r (5 of 5)
response (in Christian liturgy)
Word Origin for R.
(sense 3) Latin: Queen (sense 6) Latin: King
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for r (1 of 2)
Medical definitions for r (2 of 2)
radical (usually an alkyl or aryl group)
respiratory exchange ratio
or r roentgen
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for r (1 of 2)
Abbreviation of radius
Scientific definitions for r (2 of 2)
The symbol for resistance.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Idioms and Phrases with r
see three R's.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.