in·​fill ˈin-ˌfil How to pronounce infill (audio)
: 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
: 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 Slipped into the lot, the 1,200-square-foot ADU, or IDU as the architects like to refer to the infill dwelling unit, was built an inch from the 1920s bungalow, five feet from the duplex and four feet from the property line. Lisa Boone, Los Angeles Times, 21 Nov. 2023 The 2003 blaze’s lessons accelerated a shift toward urban infill development and away from building in fire-prone backcountry areas. Oct. 22, 2023 Restoring Cuyamaca’s tree canopy is years away. San Diego Union-Tribune, 23 Oct. 2023 The Morena District and Clairemont should be prime candidates for infill projects dedicated to students. Phillip Molnar, San Diego Union-Tribune, 15 Sep. 2023 Based on numerous comments from neighbors opposed to the Noble Station apartment complex in recent weeks, area residents would rather stick with infill, mixed-income or even market-rate housing as another approach to build capacity. Thomas Jewell, cleveland, 19 Sep. 2023 The city held a couple of community meetings last fall to hear residents’ concerns, and switched from crumb rubber infill to thermoplastic elastomers (TPE) infill for the new turf to reduce PFAS leakage. Sarah Raza,, 3 Aug. 2023 Many of the Angelenos converting garages into guest houses — particularly higher income people — aren’t renting them out, and are instead using them as guest rooms or pool houses, said Mott Smith, principal with Civic Enterprise Development, an urban infill developer. Noah Bierman, Los Angeles Times, 23 Aug. 2023 While development may become a key issue in this race, this isn’t to say Goldbeck wouldn’t support expanding infill development or that Montgomery Steppe would be opposed to new subdivisions. Michael Smolens, San Diego Union-Tribune, 14 July 2023 This includes brooming out the rubber infill in the turf, watering down and sanitizing that infill and making sure the field is clear of garbage and debris. Lucas Gordon, The Arizona Republic, 13 Oct. 2022 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'infill.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1939, in the meaning defined at sense 1

Time Traveler
The first known use of infill was in 1939

Dictionary Entries Near infill

Cite this Entry

“Infill.” Dictionary, Merriam-Webster, Accessed 3 Dec. 2023.

Last Updated: - Updated example sentences
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