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  • infra
    infra
    adverb
    below, especially when used in referring to parts of a text.
  • infra-
    infra-
    a prefix meaning “below,” used, with second elements of any origin, in the formation of compound words.
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; cf. 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.

See Examples For:

“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 types of neurofeedback training that Walker practices includes amplitude training, infra low frequency, and Alpha Theta training.

From Seattle Times Jul. 12, 2022

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

Haverfield, quoted by Plummer, ad loc.; cf. infra c.

From Bede's Ecclesiastical History of England by Cuthbert Bede

For Kant, Intuition was infra- intellectual, but for Bergson it is supra-intellectual.

From Bergson and His Philosophy by John Alexander Gunn

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