An opening, road, or track, available for passing; especially, one through or over some dangerous or otherwise impracticable barrier; a passageway; a defile; a ford; as, a mountain pass.

The lowest passage between two mountains. The french - but not just the french - know this as a col. The mathematicians would call this the saddle point.

the location in a range of mountains of a geological formation that is lower than the surrounding peaks; "we got through the pass before it started to snow"

a saddle point for the surface, a term adopted from terrain analysis

A low point between two mountain summits

A depression or gap in a range of mountains or hills permitting easier passage from one side to the other.

Any route from one valley, over higher ground to another valley. Usually, a relatively low point along a ridge. Many regional synonyms, such as "notch" in New England.

the lowest or easiest crossing of a ridge.

Relatively low point on a ridge or in a mountain chain, allowing travel from one valley to another.

Narrow low spot between mountain peaks; lowest point along a mountain crest. Pass is generally used in the West, while "gap" is used in the South, and "notch" in New England.

Establishment of the point number

A low place in a mountain range.