1. Having no boundaries or limits; impossible to measure or calculate. See Synonyms at incalculable.
2. Immeasurably great or large; boundless: infinite patience; a discovery of infinite importance.
a. Existing beyond or being greater than any arbitrarily large value.
b. Unlimited in spatial extent: a line of infinite length.
c. Of or relating to a set capable of being put into one-to-one correspondence with a proper subset of itself.
[Middle English infinit, from Old French, from Latin īnfīnītus : in-, not; see IN-1 + fīnītus, finite, from past participle of fīnīre, to limit; see FINITE.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.