ana·​gen·​e·​sis | \ˌa-nə-ˈje-nə-səs \

Definition of anagenesis 

: evolutionary change producing a single lineage in which one taxon replaces another without branching — compare cladogenesis

Examples of anagenesis in a Sentence

Recent Examples on the Web

A new tyrannosaur with evidence with evidence for anagenesis and crocodile-like facial sensory system. Darren Naish, Scientific American Blog Network, "The Sensitive Face of a Big Predatory Dinosaur," 16 June 2017 According to Horner’s paper, this linear sort of evolution—called anagenesis—possibly could have resulted in the iconic Tyrannosaurus rex. Michael Greshko, National Geographic, "This Is Our Best Look Yet at a Tyrannosaur’s Face," 30 Mar. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'anagenesis.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of anagenesis

circa 1882, in the meaning defined above

History and Etymology for anagenesis

New Latin

Keep scrolling for more

Learn More about anagenesis

Share anagenesis

Statistics for anagenesis

Look-up Popularity

Time Traveler for anagenesis

The first known use of anagenesis was circa 1882

See more words from the same year

More from Merriam-Webster on anagenesis Encyclopedia article about anagenesis

Comments on anagenesis

What made you want to look up anagenesis? Please tell us where you read or heard it (including the quote, if possible).


the figure or shape of a crescent moon

Get Word of the Day daily email!

Test Your Vocabulary

Late Autumn 2018 Words of the Day Quiz

  • frosted-autumn-leaves
  • Which is a synonym of yahoo?
Spell It

Can you spell these 10 commonly misspelled words?

Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!