An imaginary line that connects points of equal height value eg the elevation of the land surface above or below a vertical datum, in this case of LINZ topographic mapping, this is Mean Sea Level.
Data Dictionary for contour: apps.linz.govt.nz/topo-data-dictionary/index.aspx?...
Although captured and presented at 1:25,000 this layer, for all intents and purposes, forms part of the Topo50 map series.
Further information on Topo50:
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|Category||Topographic > NZ Topo Offshore Islands Data > Relief|
|Metadata||ISO 19115/19139, Dublin Core|
|Data type||Vector linestring||Feature count||58|
|Attributes||definition, designated, nat_form, elevation|
|Services||Vector Query API, Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed|