1. the highest edge or crest of a ridge, especially of a mountain or hill
Usage: geography; topography
2. the line formed by the junction of two sloping surfaces, especially on a roof
Usage: architecture; construction

Examples

• The hikers followed the ridgeline for several miles.
• From the ridgeline, we could see valleys on both sides.
• The cabin was built just below the ridgeline to avoid strong winds.
• Snow accumulated along the mountain’s ridgeline.
• The roof’s ridgeline runs north to south.
• Workers installed vents along the ridgeline of the house.
• The ridgeline was clearly visible against the evening sky.