Definition of "infill"

infill¹

verb
third-person singular simple present infills, present participle infilling, simple past and past participle infilled
1. To fill in a space, hole or gap.
  Quotations
  Here the original drawing is shown in grey and the infilled tracing in black. The lettering can be further refined and, unlike ink-based artwork, can be rekerned without being redrawn.
  2011, Andrew Haslam, Lettering: A Reference Manual of Techniques
2. (urban studies) To rededicate land in an urban environment to new construction.
noun
countable and uncountable, plural infills
1. That which fills in a space, hole or gap.
  Quotations
  Government needs to provide certainty to the rail freight industry with infill electrification programmes [...]. "First, it's about Government committing to infill electrification so we can do things with the locomotives we already have, and then a rolling plan of electrification."
  2020 July 15, “Rail freight sector demands Government commitment”, in Rail, page 10
2. (cosmetics) The redecoration of a fingernail or toenail after it has grown, to prevent an unsightly gap.

infill²

noun
countable and uncountable, plural infills
1. Alternative form of infil (“infiltration”).
  Quotations
  Hinton and I were briefed at the TOC and received maps of our AO to memorize and mark with codes for the primary and secondary LZs for infill and exfill.
  1991, John Leppelman, Blood on the risers: an airborne soldier's thirty-five months in Vietnam
  Pedestrian infill/exfill from Atwater Street
  2011, Brett Newman, Detroit Convention Center: A Design Process and Typological Study