Dictionary.com
Thesaurus.com
Synonyms

infra

1 American  
[in-fruh] / ˈɪn frə /

adverb

  1. below, especially when used in referring to parts of a text.

infra- 2 American  

  1. a prefix meaning “below,” used, with second elements of any origin, in the formation of compound words.

    infrasonic; infrared.
infra- 1 British  

prefix

  1. below; beneath; after

    infrasonic

    infralapsarian
"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
infra 2 British  
/ ˈɪnfrə /

adverb

  1. (esp in textual annotation) below; further on

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of infra1

1730–40; < Latin infrā; under

Origin of infra-2

< Latin, representing infrā, adv. or preposition

Compare meaning

How does infra compare to similar and commonly confused words? Explore the most common comparisons:

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“To date, we have not detected any material go-live constraint that would cause us to throttle-back our AI revenue estimates for the cloud infra providers.”

From Barron's • Oct. 22, 2025

The infra push is also something that will have long-term payoffs.

From BBC • Apr. 30, 2024

"The AI infra will enable it to provide accurate recommendations and cross sell products and services across its giant network of clients in retail, telecom, and financial space," he said.

From Reuters • Sep. 8, 2023

Gov. Spencer Cox last month, “is to turn the AG folks into road map not a road block on these large infra projects.”

From Los Angeles Times • Dec. 16, 2015

Aldhelm wrote his prose work first.878.His style is turgid and grandiloquent, and, owing to the high estimation in which he was held, his influence in this respect on contemporary writing was harmful.879.Cf. infra c.

From Bede's Ecclesiastical History of England by Bede, Cuthbert

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.