Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

semi-infinite

adjective \ "+ \

Definition of semi-infinite

1 : extending to infinity in one direction or dimension
  • the propagation of a temperature wave along a semi-infinite rod
2 : limited only by an infinite plane
  • a semi-infinite metal with a constant flux of heat into its surface
  • —M. L. Storm

There's more!

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!
Already a subscriber? Log in.

Seen and Heard

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

show hide

Love words? Need even more definitions?

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

Love words? Need even more definitions?

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

Words at Play

Ask the Editors

Word Games