Word of the Day
Apps by Dictionary
Quiz: Remember the definition of mal de mer?
the utility of a behavioral trait or of a physical feature of an organism in aiding the survival and reproduction of the organism.
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for
If nothing else, religion has tremendous genetic
However, goods can be desirable for a reason other than
The ability to distinguish similar spoken sounds is clearly of
It is selfish behavior with no
for our planet.
Both aggression and more peaceful traits have
so we're likely to find both in humans.
And it may have
in that it promotes group cohesion, and helps leaders to organize and control the group's members.
For natural selection is oblivious to the
of camouflage and other adaptive strategies.
There is of course an alternative view, and that is that religion is a byproduct of other traits which have
Discover our greatest slideshows
Was spring actually called "Lent"...
15 Shades of Green: Emerald...
Beyond Leprechauns: 7 Creatures of...
7 Words with Real Character
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
Nearby words for survival value
survival of the fittest
sus. per coll.