Simple Definition of natural selection

from our Learner's Dictionary

natural selection

noun

: the process by which plants and animals that can adapt to changes in their environment are able to survive and reproduce while those that cannot adapt do not survive

Cite this Entry

Style

“Natural selection.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/natural%20selection. Accessed 20 Jun. 2026.

Copy Citation

More from Merriam-Webster

Word of the Day

longueur

Listen to the pronunciation of longueur

See Definitions and Examples »

Get Word of the Day daily email!

Popular in Grammar & Usage

'Canceled' or 'cancelled'?

5 Verbal Slip Ups and Language Mistakes

Is that lie 'bald-faced' or 'bold-faced'?

'A' or 'an'? What about before 'h'? An Indefinite Article Guide

The Difference Between 'i.e.' and 'e.g.'

Popular in Wordplay

One-Word Oxymorons: Bittersweet, Spendthrift, and More

8 Obscure Words for Sleepy Times

Cattywampus, Taradiddle, and More Funny-Sounding Words

The Words of the Week - Jun 19

12 Lovely and Unusual Words for the Natural World

Popular

'Canceled' or 'cancelled'?

One-Word Oxymorons: Bittersweet, Spendthrift, and More

8 Obscure Words for Sleepy Times