levelein

Levelein is a term found in Dutch-language technical texts that denotes a line on a plan or map representing a constant vertical position or grade. It is conceptually similar to an elevation line or contour line, but it is not a standardized term and may appear in regional, project-specific, or older sources. The exact definition can vary by field.

In surveying, civil engineering, and architecture, a levelein serves as a reference for establishing horizontal alignment or for checking leveling during construction. It may mark a base plane for instruments, guide foundation work, or help ensure that components stay level across a structure. In cartography, levelein is sometimes used informally to describe a line of equal height on a drawing, though authorities typically use hoogtelijn (elevation line) or contourlijn.

Because levelein lacks universal standardization, practitioners often substitute more common terms or specify its meaning within a project. The term may appear in manuals or regional guides and is less frequent in contemporary mainstream technical writing. For readers, the key point is that levelein refers to a height- or grade-indicating line on plans, whose exact interpretation depends on context.