Vicinal ("In the neighbourhood of") is a general adjective used as a standard, specific, technical descriptor in a range of contexts, including:
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Vicinal (chemistry), stands for any two functional groups bonded to two adjacent atoms.
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Vicinal tramway or Buurtspoor, a system of narrow gauge tramways or local railways in Belgium.
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In materials science, a "vicinal substrate" is a thin film whose surface normal deviates slightly from a major crystallographic axis.
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In physics, the exclusion zone of changed physical/molecular structure at the boundary of many liquids and a barrier has been described as the interfacial layer or the vicinal layer.
