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infill

or in-fill

[in-fil]
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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.
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adjective
  1. of, relating to, or involving the use of infill in urban planning: infill condominium projects; infill office buildings and retail space.
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Origin of infill

First recorded in 1875–80; in-1 + fill
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for in-fill

infill

infilling (ˈɪnfɪlɪŋ)

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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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