infill

noun

in·​fill ˈin-ˌfil How to pronounce infill (audio)
1
: material that fills in something (such as a hole or the spaces between a building's structural members)
volcanic infill
fiberglass infill
The artificial turf being used contains infill that is made from recycled tires …Greg Fitzpatrick
It's framed with hand-hewn cypress posts and beams, though instead of … brick infill … the walls are formed from … a mixture of mud, moss, and animal hair that was once used by native Americans living in the area.Amy R. Hughes
2
: new buildings constructed in the space available between existing structures
Urban infill, a big theme these days in city planning, is essentially the opposite of "urban sprawl." As cities grow, planners are looking for ways to pack more people into places that are already developed.Franklyn Cater
often used before another noun
St. Louis must be the infill capital of the nation. Liberally scattered over the city, especially in the older parts, you see clumps and blocks of new apartments, condominia and row houses tucked in among centenarian neighbors.E. F. Porter
infill housing
infill verb, transitive + intransitive
infilled; infilling
… it was easier to achieve the vaults themselves by building them of a framework of ribs infilled with webs. James F. O'Gorman
Stump holes can be expected to infill with material from the pit walls and immediate vicinity … Jonathan D. Phillips et al.

Examples of infill in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Newsom’s streamlining of CEQA requirements retains most environmental protections but imposes realistic timelines and limits external delays that substantially add time and cost to urban infill projects. Phillip Molnar, San Diego Union-Tribune, 10 July 2025 Lower infill and high-density areas from 8-20 to 6-12 units per acre. Nick Rosenberger, Idaho Statesman, 11 June 2025 An infill project builds on vacant or underutilized land in urban areas. Charlotte Observer, 4 July 2025 The city has a program in place, called Complete Communities, that already speeds up many infill projects. Phillip Molnar, San Diego Union-Tribune, 1 July 2025 See All Example Sentences for infill

Word History

First Known Use

1939, in the meaning defined at sense 1

Time Traveler
The first known use of infill was in 1939

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Cite this Entry

“Infill.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/infill. Accessed 25 Jul. 2025.

Last Updated: - Updated example sentences
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