Definition of fallout
(Entry 1 of 2)
1a
: the often radioactive particles stirred up by or resulting from a nuclear explosion and descending through the atmosphere
also
: other polluting particles (such as volcanic ash) descending likewise
b
: descent (as of fallout) through the atmosphere
2
: a secondary and often lingering effect, result, or set of consequences
have to take a position and accept the political fallout— Andy Logan
fall out
verb
fell out; fallen out; falling out; falls out
Definition of fall out (Entry 2 of 2)
3a
: to leave one's place in the ranks
b
: to leave a building in order to take one's place in a military formation
Test Your Vocabulary
Great Words for Scrabble
-
- Which of the following Q-without-U words means the number five in cards or dice?

Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share fallout
Time Traveler for fallout
The first known use of fallout was in the 15th century
See more words from the same century