ac·​cre·​tion·​al | \ ə-ˈkrē-shnəl How to pronounce accretional (audio) , -shə-nᵊl, a- \

Definition of accretional

: relating to, marked by, or formed by accretion : accretionary accretional remnants left over from the formation of the terrestrial planets …— Paul R. Weissman et al., Encyclopedia of the Solar System, 1999 accretional growth

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of accretional

1843, in the meaning defined above

Buying Guide

A love for education starts at an early age. The Reviews team researched the best science toys for kids to jumpstart their learning.

Learn More About accretional

Time Traveler for accretional

Time Traveler

The first known use of accretional was in 1843

See more words from the same year

Dictionary Entries Near accretional



accretionary hypothesis

See More Nearby Entries 

Statistics for accretional

Cite this Entry

“Accretional.” Dictionary, Merriam-Webster, Accessed 10 Aug. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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