Try Our Apps
The Word of the Year is...
the derivative of a function:
Velocity is the first derivative of distance with respect to time.
Based on the Random House Dictionary, © Random House, Inc. 2016.
Cite This Source
Discover our greatest slideshows
8 Offbeat Literary Genres to Get...
Decode the pieces of our favorite...
Know These 9 Commonly Confused...
Uncover the mysteries of the marks...
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 first derivative
first crack out of the box
first cranial nerve
first cuneiform bone
first duke of york
first earl of cromer
first earl of dorset
Piece of cake?