Word of the Day
Apps by Dictionary
Know how to use "fewer" and "less"? Find out.
the independent development of closely corresponding adaptive features in two or more groups of organisms that occupy different but equivalent habitats, as marsupial mammals in Australia and placental mammals on other continents.
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Discover our greatest slideshows
8 Wintry Words
A lot vs. Alot: 9 Grammatical...
10 Words Coined in the Sci-Fi...
9 Words About Beginnings
Browse more topics on our blog
What Is the Difference Between Discreet and Discrete?
Learn the correct uses of these two commonly confused homophones.
What Character Was Removed from the Alphabet?
What mistaken pronunciation gave this character its name?
This small mark has two primary uses: to signify possession or omitted letters.
How Do I Get a Word into the Dictionary?
People invent new words all the time, but which ones actually make it?
Word of the Day
Difficulty index for
Few English speakers likely know this word
Word Value for
Words With Friends
Faith. Belief without evidence in what is told by one who speaks without knowledge, of things...
For after all man knows mighty little, and may some day learn enough of his own ignorance to fall...
Henry Brooks Adams
The beast exists because it is stronger than the thing that you call evolution. In it is some force...
Nearby words for parallel-evolution
parallel of altitude
parallel of latitude
parallel presence detect
parallel random-access machine
parallel server option
parallel virtual machine