infill

American  

[in-fil] / ˈɪnˌfɪl /

Or in-fill

verb (used with object)

1. to fill in.

   The old stream beds have been infilled with sediment.

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noun

1. the planned conversion of empty lots, underused or rundown buildings, and other available space in densely built-up urban and suburban areas for use as sites for commercial buildings and housing, frequently as an alternative to overdevelopment of rural areas.

adjective

1. of, relating to, or involving the use of infill in urban planning.

   infill condominium projects; infill office buildings and retail space.

infill British  

/ ˈɪnfɪl /

noun

1. the act of filling or closing gaps, etc, in something, such as a row of buildings

2. material used to fill a cavity, gap, hole, etc

3. an acrylic gel application that fills in the gap between a false nail and the root of the real nail, which is created as the real nail grows

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Etymology

Origin of infill

First recorded in 1875–80; in- ¹ + fill

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Example Sentences

See Examples For:

infill

Development first took hold closer to Center City, where demand was strongest, then moved outward in the 2010s into adjacent rowhouse neighborhoods, including Fishtown, as property values rose and more infill projects became financially viable.

From The Wall Street Journal ● Jun. 11, 2026

City Hall insisted the design followed Football Foundation guidance to contain rubber infill with raised barriers, boot brushes, matting and filtered drainage, which it said Natural England had not objected to.

From BBC ● Mar. 6, 2026

Specifically, the Assembly bill will exempt most urban infill housing from CEQA, meaning most housing projects built in already-developed areas will no longer be required to undergo environmental review.

From Los Angeles Times ● Jul. 1, 2025

To the extent infill grew its share of the pie, it was because the 2008 housing crash sent tract-home sprawl down to levels not seen since the Eisenhower administration.

From Slate ● Jun. 3, 2025

Naught but the clay, as to a rapture fond Could he with fire of genius thus infill!

From The Optimist's Good Morning by Florence Hobart Perin

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